Method for reporting channel state information in wireless communication system, and device therefor

ABSTRACT

The present disclosure provides a method for reporting channel state information (CSI) in a wireless communication system, and a device therefor. Specifically, the present invention provides a method for reporting CSI via a physical uplink shared channel (PUSCH) by a user equipment (UE) in a wireless communication system, the method comprising the steps of: receiving configuration information from a base station (BS), wherein the configuration information comprises (i) a CSI-related configuration and (ii) a configuration related to a transmission power control of the PUSCH; receiving a CSI-reference signal (CSI-RS) from the base station on the basis of the CSI-related configuration; calculating the CSI on the basis of the CSI-RS, wherein the CSI comprises information related with coefficients, elements of the information related with coefficients are classified into multiple groups on the basis of priority values thereof, and the priority values have an ascending sequence in which, with reference to a predefined particular index, a higher index and a lower index of frequency-domain indices related to the elements sequentially alternate; and on the basis of predetermined priorities of the multiple groups, transmitting a CSI report configured by omitting a portion of the multiple groups, to the base station via the PUSCH, wherein transmission power of the PUSCH is determined on the basis of the configuration information.

TECHNICAL FIELD

The present disclosure relates to a wireless communication system, andmore particularly, to a method for reporting channel state informationin consideration of a payload of channel state information, and a devicefor supporting the same.

BACKGROUND ART

Mobile communication systems have been developed to guarantee useractivity while providing voice services. Mobile communication systemsare expanding their services from voice only to data. Current soaringdata traffic is depleting resources and users' demand for higher-datarate services is leading to the need for more advanced mobilecommunication systems.

Next-generation mobile communication systems are required to meet, e.g.,handling of explosively increasing data traffic, significant increase inper-user transmission rate, working with a great number of connectingdevices, and support for very low end-to-end latency and high-energyefficiency. To that end, various research efforts are underway forvarious technologies, such as dual connectivity, massive multiple inputmultiple output (MIMO), in-band full duplex, non-orthogonal multipleaccess (NOMA), super wideband support, and device networking.

DISCLOSURE Technical Problem

The present disclosure proposes a method of reporting channel stateinformation (CSI) in a wireless communication system.

Specifically, the present disclosure considers the payload of thechannel state information (CSI), and when the size of the payload of thechannel state information is greater than the resource capacityallocated for the CSI, proposes a method of omitting a part of the CSI.

In addition, the present disclosure proposes a method of determining apriority of CSI parameters in order to perform omission of a part ofchannel state information.

In addition, the present disclosure proposes a method of reporting CSIby configuring the CSI into a first part and a second part.

In addition, the present disclosure proposes a method for transmittingchannel state information based on PUSCH power control.

Technical problems to be solved by the present disclosure are notlimited by the above-mentioned technical problems, and other technicalproblems which are not mentioned above can be clearly understood fromthe following description by those skilled in the art to which thepresent disclosure pertains.

Technical Solution

In the present disclosure, a method of reporting channel stateinformation (CSI) through physical uplink shared channel (PUSCH), by auser equipment (UE), in a wireless communication system, the methodcomprising: receiving, from a base station, configuration information,wherein the configuration information includes (i) a CSI relatedconfiguration and (ii) a configuration related to transmission powercontrol of the PUSCH; receiving, from the base station, a CSI-referencesignal (CSI-RS) based on the CSI related configuration; computing CSIbased on the CSI-RS, wherein the CSI includes information related tocoefficients, wherein each of elements of the information related to thecoefficients is classified as a plurality of groups based on a priorityvalue, and wherein the priority value increases as an order in which ahigher index and a lower index of indexes of a frequency domain relatedto the elements are sequentially crossed based on a predefined specificindex; and transmitting, to the base station, a CSI report configured byomitting, among the plurality of groups, a portion of the plurality ofgroups based on a pre-defined priority of the plurality of groups,through the PUSCH, wherein a transmission power of the PUSCH isdetermined based on the configuration information.

Furthermore, in the present disclosure, wherein the priority value isdetermined based on i) a layer index ii) an index of a spatial domainrelated to each element and iii) an index of a frequency domain relatedto each elements.

Furthermore, in the present disclosure, wherein the smaller the priorityvalue, the higher the priority of each element.

Furthermore, in the present disclosure, wherein the priority valueincreases in an ascending order of the index of the spatial domain.

Furthermore, in the present disclosure, wherein a priority of i) theindex of the spatial domain of a strongest coefficient and ii) an indexof the spatial domain corresponding to a beam having an oppositepolarization with respect to a beam corresponding to the strongestcoefficient is the highest.

Furthermore, in the present disclosure, wherein the predefined specificindex is related to an index in the frequency domain of a strongestcoefficient among the coefficients.

Furthermore, in the present disclosure, wherein the predefined specificindex is 0.

Furthermore, in the present disclosure, wherein the CSI report consistsof a first part and a second part, and wherein the CSI report is omittedin the second part.

Furthermore, in the present disclosure, wherein the CSI report furtherincludes information related to omission of the portion among theplurality of groups.

Furthermore, in the present disclosure, wherein the information relatedto the omission includes at least one of (i) information on whether toomit, (ii) information on an object to be omitted or (iii) informationon a quantity to be omitted.

Furthermore, in the present disclosure, wherein the information relatedwith coefficients includes at least one of information on an amplitudecoefficient, ii) information on a phase coefficient, or iii) bitmapinformation related to the amplitude coefficient and the phasecoefficient.

Furthermore, in the present disclosure, wherein a resource region fortransmitting the PUSCH is allocated based on the CSI relatedconfiguration, and wherein a payload size of the computed CSI exceedsthe resource region.

Furthermore, in the present disclosure, a user equipment (UE) to reportchannel state information (CSI) through physical uplink shared channel(PUSCH) in a wireless communication system, the UE comprising: one ormore transceivers; one or more processors; and one or more memoriesstoring instructions for operations executed by the one or moreprocessors and coupled to the one or more processors, wherein theoperations comprise: receiving, from a base station, configurationinformation, wherein the configuration information includes (i) a CSIrelated configuration and (ii) a configuration related to transmissionpower control of the PUSCH; receiving, from the base station, aCSI-reference signal (CSI-RS) based on the CSI related configuration;computing CSI based on the CSI-RS, wherein the CSI includes informationrelated to coefficients, wherein each of elements of the informationrelated to the coefficients is classified as a plurality of groups basedon a priority value, and wherein the priority value increases as anorder in which a higher index and a lower index of indexes of afrequency domain related to the elements are sequentially crossed basedon a predefined specific index; and transmitting, to the base station, aCSI report configured by omitting, among the plurality of groups, aportion of the plurality of groups based on a pre-defined priority ofthe plurality of groups, through the PUSCH, wherein a transmission powerof the PUSCH is determined based on the configuration information.

Furthermore, in the present disclosure, a method of receiving channelstate information (CSI) through physical uplink shared channel (PUSCH),by a base station, in a wireless communication system, the methodcomprising: transmitting, to a user equipment (UE), configurationinformation, wherein the configuration information includes (i) a CSIrelated configuration and (ii) a configuration related to transmissionpower control of the PUSCH; transmitting, to the UE, a CSI-referencesignal (CSI-RS) based on the CSI related configuration; and receiving,from the UE, a CSI report including CSI measured based on the CSI-RS,through the PUSCH, wherein the CSI includes information related tocoefficients, wherein each of elements of the information related to thecoefficients is classified as a plurality of groups based on a priorityvalue, wherein the priority value increases as an order in which ahigher index and a lower index of indexes of a frequency domain relatedto the elements are sequentially crossed based on a predefined specificindex, wherein the CSI report is configured by omitting, among theplurality of groups, a portion of the plurality of groups based on apre-defined priority of the plurality of groups, and wherein atransmission power of the PUSCH is determined based on the configurationinformation.

Furthermore, in the present disclosure, a base station to receivechannel state information (CSI) through physical uplink shared channel(PUSCH) in a wireless communication system, the base station comprising:one or more transceivers; one or more processors; and one or morememories storing instructions for operations executed by the one or moreprocessors and coupled to the one or more processors, wherein theoperations comprise: transmitting, to a user equipment (UE),configuration information, wherein the configuration informationincludes (i) a CSI related configuration and (ii) a configurationrelated to transmission power control of the PUSCH; transmitting, to theUE, a CSI-reference signal (CSI-RS) based on the CSI relatedconfiguration; and receiving, from the UE, a CSI report including CSImeasured based on the CSI-RS, through the PUSCH, wherein the CSIincludes information related to coefficients, wherein each of elementsof the information related to the coefficients is classified as aplurality of groups based on a priority value, wherein the priorityvalue increases as an order in which a higher index and a lower index ofindexes of a frequency domain related to the elements are sequentiallycrossed based on a predefined specific index, wherein the CSI report isconfigured by omitting, among the plurality of groups, a portion of theplurality of groups based on a pre-defined priority of the plurality ofgroups, and wherein a transmission power of the PUSCH is determinedbased on the configuration information.

Furthermore, in the present disclosure, an apparatus comprising one ormore memories and one or more processors operatively coupled to the oneor more memories, the apparatus comprising: wherein the one or moreprocessors controls the apparatus to: receive, from a base station,configuration information, wherein the configuration informationincludes (i) a CSI related configuration and (ii) a configurationrelated to transmission power control of the PUSCH; receive, from thebase station, a CSI-reference signal (CSI-RS) based on the CSI relatedconfiguration; compute CSI based on the CSI-RS, wherein the CSI includesinformation related to coefficients, wherein each of elements of theinformation related to the coefficients is classified as a plurality ofgroups based on a priority value, and wherein the priority valueincreases as an order in which a higher index and a lower index ofindexes of a frequency domain related to the elements are sequentiallycrossed based on a predefined specific index; and transmit, to the basestation, a CSI report configured by omitting, among the plurality ofgroups, a portion of the plurality of groups based on a pre-definedpriority of the plurality of groups, through the PUSCH, wherein atransmission power of the PUSCH is determined based on the configurationinformation.

Furthermore, in the present disclosure, one or more non-transitorycomputer-readable media storing one or more instructions, the one ormore instructions executable by one or more processors comprising: aninstruction instructs a user equipment (UE) to: receive, from a basestation, configuration information, wherein the configurationinformation includes (i) a CSI related configuration and (ii) aconfiguration related to transmission power control of the PUSCH;receive, from the base station, a CSI-reference signal (CSI-RS) based onthe CSI related configuration; compute CSI based on the CSI-RS, whereinthe CSI includes information related to coefficients, wherein each ofelements of the information related to the coefficients is classified asa plurality of groups based on a priority value, and wherein thepriority value increases as an order in which a higher index and a lowerindex of indexes of a frequency domain related to the elements aresequentially crossed based on a predefined specific index; and transmit,to the base station, a CSI report configured by omitting, among theplurality of groups, a portion of the plurality of groups based on apre-defined priority of the plurality of groups, through the PUSCH,wherein a transmission power of the PUSCH is determined based on theconfiguration information.

Advantageous Effects

According to an embodiment of the present disclosure, it is possible toreport the channel state information to the base station inconsideration of the payload size of the channel state information.

According to an embodiment of the present disclosure, it is possible toreport the channel state information within an allocated resourcecapacity by partially omitting channel state information.

In addition, according to an embodiment of the present disclosure, it ispossible to report channel state information by performing an omittingoperation in consideration of a priority of components of the channelstate information to minimize a loss of information within the allocatedresource capacity.

In addition, according to an embodiment of the present disclosure, it ispossible to eliminate ambiguity of operations related to a CSI omission.

In addition, according to an embodiment of the present disclosure, it ispossible to perform power control when channel state information isreported through PUSCH.

Effects obtainable from the present disclosure are not limited by theeffects mentioned above, and other effects which are not mentioned abovecan be clearly understood from the following description by thoseskilled in the art to which the present disclosure pertains.

BRIEF DESCRIPTION OF DRAWINGS

The accompanying drawings, which are included to provide a furtherunderstanding of the present disclosure and constitute a part of thedetailed description, illustrate embodiments of the present disclosureand together with the description serve to explain the principle of thepresent disclosure.

FIG. 1 is a diagram illustrating an example of an overall systemstructure of NR to which a method proposed in the present disclosure maybe applied.

FIG. 2 illustrates a relationship between an uplink frame and a downlinkframe in a wireless communication system to which a method proposed inthe present disclosure may be applied.

FIG. 3 illustrates an example of a frame structure in an NR system.

FIG. 4 illustrates an example of a resource grid supported by a wirelesscommunication system to which a method proposed in the presentdisclosure may be applied.

FIG. 5 illustrates examples of a resource grid for each antenna port andnumerology to which a method proposed in the present disclosure may beapplied.

FIG. 6 illustrates physical channels and general signal transmissionused in a 3GPP system.

FIG. 7 is a flowchart illustrating an example of a CSI-relatedprocedure.

FIG. 8 illustrates an example of a procedure for controlling uplinktransmission power.

FIG. 9 illustrates an example of index remapping in a precoding matrixbased on a strongest coefficient indicator (SCI).

FIG. 10 illustrates an example of setting three levels of omissionpriority in a frequency domain together with a pair of SD bases.

FIG. 11 illustrates an example of a delay profile of a radio channel.

FIG. 12 illustrates an example of setting the omission priority in aspatial domain (SD) with a single frequency domain (FD) basis.

FIG. 13 illustrates an example of a flowchart of signaling between a UEand a base station to which the method and/or embodiment proposed in thepresent disclosure may be applied.

FIG. 14 illustrates an example of an operation sequence of a UEperforming CSI report to which the method and/or embodiment proposed inthe present disclosure may be applied.

FIG. 15 illustrates an example of an operation sequence of a basestation to which the method and/or embodiment proposed in the presentdisclosure may be applied.

FIG. 16 illustrates a communication system applied to the presentdisclosure.

FIG. 17 illustrates a wireless device which may be applied to thepresent disclosure.

FIG. 18 illustrates a signal processing circuit for a transmit signal.

FIG. 19 illustrates another example of a wireless device applied to thepresent disclosure.

FIG. 20 illustrates a hand-held device applied to the presentdisclosure.

MODE FOR DISCLOSURE

Reference will now be made in detail to embodiments of the disclosure,examples of which are illustrated in the accompanying drawings. Adetailed description to be disclosed below together with theaccompanying drawing is to describe exemplary embodiments of the presentdisclosure and not to describe a unique embodiment for carrying out thepresent disclosure. The detailed description below includes details toprovide a complete understanding of the present disclosure. However,those skilled in the art know that the present disclosure can be carriedout without the details.

In some cases, in order to prevent a concept of the present disclosurefrom being ambiguous, known structures and devices may be omitted orillustrated in a block diagram format based on core functions of eachstructure and device.

Hereinafter, downlink (DL) means communication from the base station tothe terminal and uplink (UL) means communication from the terminal tothe base station. In downlink, a transmitter may be part of the basestation, and a receiver may be part of the terminal. In uplink, thetransmitter may be part of the terminal and the receiver may be part ofthe base station. The base station may be expressed as a firstcommunication device and the terminal may be expressed as a secondcommunication device. A base station (BS) may be replaced with termsincluding a fixed station, a Node B, an evolved-NodeB (eNB), a NextGeneration NodeB (gNB), a base transceiver system (BTS), an access point(AP), a network (5G network), an AI system, a road side unit (RSU), avehicle, a robot, an Unmanned Aerial Vehicle (UAV), an Augmented Reality(AR) device, a Virtual Reality (VR) device, and the like. Further, theterminal may be fixed or mobile and may be replaced with terms includinga User Equipment (UE), a Mobile Station (MS), a user terminal (UT), aMobile Subscriber Station (MSS), a Subscriber Station (SS), an AdvancedMobile Station (AMS), a Wireless Terminal (WT), a Machine-TypeCommunication (MTC) device, a Machine-to-Machine (M2M) device, and aDevice-to-Device (D2D) device, the vehicle, the robot, an AI module, theUnmanned Aerial Vehicle (UAV), the Augmented Reality (AR) device, theVirtual Reality (VR) device, and the like.

The following technology may be used in various radio access systemincluding CDMA, FDMA, TDMA, OFDMA, SC-FDMA, and the like. The CDMA maybe implemented as radio technology such as Universal Terrestrial RadioAccess (UTRA) or CDMA2000. The TDMA may be implemented as radiotechnology such as a global system for mobile communications(GSM)/general packet radio service (GPRS)/enhanced data rates for GSMevolution (EDGE). The OFDMA may be implemented as radio technology suchas Institute of Electrical and Electronics Engineers (IEEE) 802.11(Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Evolved UTRA (E-UTRA), or thelike. The UTRA is a part of Universal Mobile Telecommunications System(UMTS). 3rd Generation Partnership Project (3GPP) Long Term Evolution(LTE) is a part of Evolved UMTS (E-UMTS) using the E-UTRA andLTE-Advanced (A)/LTE-A pro is an evolved version of the 3GPP LTE. 3GPPNR (New Radio or New Radio Access Technology) is an evolved version ofthe 3GPP LTE/LTE-A/LTE-A pro.

For clarity of description, the technical spirit of the presentdisclosure is described based on the 3GPP communication system (e.g.,LTE-A or NR), but the technical spirit of the present disclosure are notlimited thereto. LTE means technology after 3GPP TS 36.xxx Release 8. Indetail, LTE technology after 3GPP TS 36.xxx Release 10 is referred to asthe LTE-A and LTE technology after 3GPP TS 36.xxx Release 13 is referredto as the LTE-A pro. The 3GPP NR means technology after TS 38.xxxRelease 15. The LTE/NR may be referred to as a 3GPP system. “xxx” meansa standard document detail number. Matters disclosed in a standarddocument opened before the present disclosure may be referred to for abackground art, terms, abbreviations, etc., used for describing thepresent disclosure. For example, the following documents may be referredto.

3GPP LTE

-   -   36.211: Physical channels and modulation    -   36.212: Multiplexing and channel coding    -   36.213: Physical layer procedures    -   36.300: Overall description    -   36.331: Radio Resource Control (RRC)

3GPP NR

-   -   38.211: Physical channels and modulation    -   38.212: Multiplexing and channel coding    -   38.213: Physical layer procedures for control    -   38.214: Physical layer procedures for data    -   38.300: NR and NG-RAN Overall Description    -   38.331: Radio Resource Control (RRC) protocol specification

As more and more communication devices require larger communicationcapacity, there is a need for improved mobile broadband communicationcompared to the existing radio access technology (RAT). Further, massivemachine type communications (MTCs), which provide various servicesanytime and anywhere by connecting many devices and objects, are one ofthe major issues to be considered in the next generation communication.In addition, a communication system design considering a service/UEsensitive to reliability and latency is being discussed. Theintroduction of next generation radio access technology consideringenhanced mobile broadband communication (eMBB), massive MTC (mMTC),ultra-reliable and low latency communication (URLLC) is discussed, andin the present disclosure, the technology is called new RAT forconvenience. The NR is an expression representing an example of 5G radioaccess technology (RAT).

Three major requirement areas of 5G include (1) an enhanced mobilebroadband (eMBB) area, (2) a massive machine type communication (mMTC)area and (3) an ultra-reliable and low latency communications (URLLC)area.

Some use cases may require multiple areas for optimization, and otheruse case may be focused on only one key performance indicator (KPI). 5Gsupport such various use cases in a flexible and reliable manner.

eMBB is far above basic mobile Internet access and covers media andentertainment applications in abundant bidirectional tasks, cloud oraugmented reality. Data is one of key motive powers of 5G, and dedicatedvoice services may not be first seen in the 5G era. In 5G, it isexpected that voice will be processed as an application program using adata connection simply provided by a communication system. Major causesfor an increased traffic volume include an increase in the content sizeand an increase in the number of applications that require a high datatransfer rate. Streaming service (audio and video), dialogue type videoand mobile Internet connections will be used more widely as more devicesare connected to the Internet. Such many application programs requireconnectivity always turned on in order to push real-time information andnotification to a user. A cloud storage and application suddenlyincreases in the mobile communication platform, and this may be appliedto both business and entertainment. Furthermore, cloud storage is aspecial use case that tows the growth of an uplink data transfer rate.5G is also used for remote business of cloud. When a tactile interfaceis used, further lower end-to-end latency is required to maintainexcellent user experiences. Entertainment, for example, cloud game andvideo streaming are other key elements which increase a need for themobile broadband ability. Entertainment is essential in the smartphoneand tablet anywhere including high mobility environments, such as atrain, a vehicle and an airplane. Another use case is augmented realityand information search for entertainment. In this case, augmentedreality requires very low latency and an instant amount of data.

Furthermore, one of the most expected 5G use case relates to a functioncapable of smoothly connecting embedded sensors in all fields, that is,mMTC. Until 2020, it is expected that potential IoT devices will reach20.4 billions. The industry IoT is one of areas in which 5G performsmajor roles enabling smart city, asset tracking, smart utility,agriculture and security infra.

URLLC includes a new service which will change the industry throughremote control of major infra and a link having ultra reliability/lowavailable latency, such as a self-driving vehicle. A level ofreliability and latency is essential for smart grid control, industryautomation, robot engineering, drone control and adjustment.

Multiple use cases are described more specifically.

5G may supplement fiber-to-the-home (FTTH) and cable-based broadband (orDOCSIS) as means for providing a stream evaluated from gigabits persecond to several hundreds of mega bits per second. Such fast speed isnecessary to deliver TV with resolution of 4K or more (6K, 8K or more)in addition to virtual reality and augmented reality. Virtual reality(VR) and augmented reality (AR) applications include immersive sportsgames. A specific application program may require a special networkconfiguration. For example, in the case of VR game, in order for gamecompanies to minimize latency, a core server may need to be integratedwith the edge network server of a network operator.

An automotive is expected to be an important and new motive power in 5G,along with many use cases for the mobile communication of an automotive.For example, entertainment for a passenger requires a high capacity anda high mobility mobile broadband at the same time. The reason for thisis that future users continue to expect a high-quality connectionregardless of their location and speed. Another use example of theautomotive field is an augmented reality dashboard. The augmentedreality dashboard overlaps and displays information, identifying anobject in the dark and notifying a driver of the distance and movementof the object, over a thing seen by the driver through a front window.In the future, a wireless module enables communication betweenautomotives, information exchange between an automotive and a supportedinfrastructure, and information exchange between an automotive and otherconnected devices (e.g., devices accompanied by a pedestrian). A safetysystem guides alternative courses of a behavior so that a driver candrive more safely, thereby reducing a danger of an accident. A next stepwill be a remotely controlled or self-driven vehicle. This requires veryreliable, very fast communication between different self-driven vehiclesand between an automotive and infra. In the future, a self-drivenvehicle may perform all driving activities, and a driver will be focusedon things other than traffic, which cannot be identified by anautomotive itself. Technical requirements of a self-driven vehiclerequire ultra-low latency and ultra-high speed reliability so thattraffic safety is increased up to a level which cannot be achieved by aperson.

A smart city and smart home mentioned as a smart society will beembedded as a high-density radio sensor network. The distributed networkof intelligent sensors will identify the cost of a city or home and acondition for energy-efficient maintenance. A similar configuration maybe performed for each home. All of a temperature sensor, a window andheating controller, a burglar alarm and home appliances are wirelesslyconnected. Many of such sensors are typically a low data transfer rate,low energy and a low cost. However, for example, real-time HD video maybe required for a specific type of device for surveillance.

The consumption and distribution of energy including heat or gas arehighly distributed and thus require automated control of a distributedsensor network. A smart grid collects information, and interconnectssuch sensors using digital information and a communication technology sothat the sensors operate based on the information. The information mayinclude the behaviors of a supplier and consumer, and thus the smartgrid may improve the distribution of fuel, such as electricity, in anefficient, reliable, economical, production-sustainable and automatedmanner. The smart grid may be considered to be another sensor networkhaving small latency.

A health part owns many application programs which reap the benefits ofmobile communication. A communication system can support remotetreatment providing clinical treatment at a distant place. This helps toreduce a barrier for the distance and can improve access to medicalservices which are not continuously used at remote farming areas.Furthermore, this is used to save life in important treatment and anemergency condition. A radio sensor network based on mobilecommunication can provide remote monitoring and sensors for parameters,such as the heart rate and blood pressure.

Radio and mobile communication becomes increasingly important in theindustry application field. Wiring requires a high installation andmaintenance cost. Accordingly, the possibility that a cable will bereplaced with reconfigurable radio links is an attractive opportunity inmany industrial fields. However, to achieve the possibility requiresthat a radio connection operates with latency, reliability and capacitysimilar to those of the cable and that management is simplified. Lowlatency and a low error probability is a new requirement for aconnection to 5G.

Logistics and freight tracking is an important use case for mobilecommunication, which enables the tracking inventory and packagesanywhere using a location-based information system. The logistics andfreight tracking use case typically requires a low data speed, but awide area and reliable location information.

In a new RAT system including NR uses an OFDM transmission scheme or asimilar transmission scheme thereto. The new RAT system may follow OFDMparameters different from OFDM parameters of LTE. Alternatively, the newRAT system may follow numerology of conventional LTE/LTE-A as it is orhave a larger system bandwidth (e.g., 100 MHz). Alternatively, one cellmay support a plurality of numerologies. In other words, UEs thatoperate with different numerologies may coexist in one cell.

The numerology corresponds to one subcarrier spacing in a frequencydomain. Different numerologies may be defined by scaling referencesubcarrier spacing to an integer N.

DEFINITION OF TERMS

eLTE eNB: The eLTE eNB is the evolution of eNB that supportsconnectivity to EPC and NGC.

gNB: A node which supports the NR as well as connectivity to NGC.

New RAN: A radio access network which supports either NR or E-UTRA orinterfaces with the NGC.

Network slice: A network slice is a network created by the operatorcustomized to provide an optimized solution for a specific marketscenario which demands specific requirements with end-to-end scope.

Network function: A network function is a logical node within a networkinfrastructure that has well-defined external interfaces andwell-defined functional behaviour.

NG-C: A control plane interface used on NG2 reference points between newRAN and NGC.

NG-U: A user plane interface used on NG3 references points between newRAN and NGC.

Non-standalone NR: A deployment configuration where the gNB requires anLTE eNB as an anchor for control plane connectivity to EPC, or requiresan eLTE eNB as an anchor for control plane connectivity to NGC.

Non-standalone E-UTRA: A deployment configuration where the eLTE eNBrequires a gNB as an anchor for control plane connectivity to NGC.

User plane gateway: A termination point of NG-U interface.

Overview of System

FIG. 1 illustrates an example of an overall structure of a NR system towhich a method proposed in the present disclosure is applicable.

Referring to FIG. 1, an NG-RAN consists of gNBs that provide an NG-RAuser plane (new AS sublayer/PDCP/RLC/MAC/PHY) and control plane (RRC)protocol terminations for a user equipment (UE).

The gNBs are interconnected with each other by means of an Xn interface.

The gNBs are also connected to an NGC by means of an NG interface.

More specifically, the gNBs are connected to an access and mobilitymanagement function (AMF) by means of an N2 interface and to a userplane function (UPF) by means of an N3 interface.

New RAT (NR) Numerology and Frame Structure

In the NR system, multiple numerologies may be supported. Thenumerologies may be defined by subcarrier spacing and a CP (CyclicPrefix) overhead. Spacing between the plurality of subcarriers may bederived by scaling basic subcarrier spacing into an integer N (or μ). Inaddition, although a very low subcarrier spacing is assumed not to beused at a very high subcarrier frequency, a numerology to be used may beselected independent of a frequency band.

In addition, in the NR system, a variety of frame structures accordingto the multiple numerologies may be supported.

Hereinafter, an orthogonal frequency division multiplexing (OFDM)numerology and a frame structure, which may be considered in the NRsystem, will be described.

A plurality of OFDM numerologies supported in the NR system may bedefined as in Table 1.

TABLE 1 μ Δf = 2^(μ) · 15 [kHz] Cyclic prefix 0 15 Normal 1 30 Normal 260 Normal, Extended 3 120 Normal 4 240 Normal

The NR supports multiple numerologies (or subcarrier spacing (SCS)) forsupporting various 5G services. For example, when the SCS is 15 kHz, awide area in traditional cellular bands is supported and when the SCS is30 kHz/60 kHz, dense-urban, lower latency, and wider carrier bandwidthare supported, and when the SCS is 60 kHz or higher therethan, abandwidth larger than 24.25 GHz is supported in order to overcome phasenoise.

An NR frequency band is defined as frequency ranges of two types (FR1and FR2). FR1 and FR2 may be configured as shown in Table 2 below.Further, FR2 may mean a millimeter wave (mmW).

TABLE 2 Frequency Range Corresponding designation frequency rangeSubcarrier Spacing FR1  410 MHz-7125 MHz  15, 30, 60 kHz FR2 24250MHz-52600 MHz 60, 120, 240 kHz

Regarding a frame structure in the NR system, a size of various fieldsin the time domain is expressed as a multiple of a time unit ofT_(s)=1/(Δf_(max)·N_(f)). In this case, Δf_(max)=480.10³, andN_(i)=4096. DL and UL transmission is configured as a radio frame havinga section of T_(f)=(Δf_(max)N_(f)/100)·T_(s)=10 ms. The radio frame iscomposed of ten subframes each having a section ofT_(sf)=(Δf_(max)N_(f)/1000)·T_(s)=1 ms. In this case, there may be a setof UL frames and a set of DL frames.

FIG. 2 illustrates a relation between an uplink frame and a downlinkframe in a wireless communication system to which a method proposed inthe present disclosure is applicable.

As illustrated in FIG. 2, uplink frame number i for transmission from auser equipment (UE) shall start T_(TA)=N_(TA)T_(s) before the start of acorresponding downlink frame at the corresponding UE.

Regarding the numerology μ, slots are numbered in increasing order ofn_(s) ^(μ)ϵ{0, . . . , N_(subframe) ^(slots, μ)−1} within a subframe andare numbered in increasing order of n_(s,f) ^(μ)ϵ{0, . . . , N_(frame)^(slots, μ)−1} within a radio frame. One slot consists of consecutiveOFDM symbols of N_(symb) ^(μ), and N_(symb) ^(μ) is determined dependingon a numerology used and slot configuration. The start of slots n_(s)^(μ) in a subframe is aligned in time with the start of OFDM symbolsn_(s) ^(μ)N_(symb) ^(μ) in the same subframe.

Not all UEs are able to transmit and receive at the same time, and thismeans that not all OFDM symbols in a downlink slot or an uplink slot areavailable to be used.

Table 3 represents the number N_(symb) ^(slot) of OFDM symbols per slot,the number N_(slot) ^(frame, μ) of slots per radio frame, and the numberN_(slot) ^(subframe, μ) of slots per subframe in a normal CP. Table 4represents the number of OFDM symbols per slot, the number of slots perradio frame, and the number of slots per subframe in an extended CP.

TABLE 3 μ N_(symb) ^(slot) N_(slot) ^(frame, μ) N_(slot) ^(subframe, μ)0 14 10 1 1 14 20 2 2 14 40 4 3 14 80 8 4 14 160 16

TABLE 4 μ N_(symb) ^(slot) N_(slot) ^(frame, μ) N_(slot) ^(subframe, μ)2 12 40 4

FIG. 3 illustrates an example of a frame structure in a NR system. FIG.3 is merely for convenience of explanation and does not limit the scopeof the present disclosure.

In Table 4, in case of μ=2, i.e., as an example in which a subcarrierspacing (SCS) is 60 kHz, one subframe (or frame) may include four slotswith reference to Table 3, and one subframe={1, 2, 4} slots shown inFIG. 3, for example, the number of slot(s) that may be included in onesubframe may be defined as in Table 3.

Further, a mini-slot may consist of 2, 4, or 7 symbols, or may consistof more symbols or less symbols.

In regard to physical resources in the NR system, an antenna port, aresource grid, a resource element, a resource block, a carrier part,etc. may be considered.

Hereinafter, the above physical resources that can be considered in theNR system are described in more detail.

First, in regard to an antenna port, the antenna port is defined so thata channel over which a symbol on an antenna port is conveyed can beinferred from a channel over which another symbol on the same antennaport is conveyed. When large-scale properties of a channel over which asymbol on one antenna port is conveyed can be inferred from a channelover which a symbol on another antenna port is conveyed, the two antennaports may be regarded as being in a quasi co-located or quasico-location (QC/QCL) relation. Here, the large-scale properties mayinclude at least one of delay spread, Doppler spread, frequency shift,average received power, and received timing.

FIG. 4 illustrates an example of a resource grid supported in a wirelesscommunication system to which a method proposed in the presentdisclosure is applicable.

Referring to FIG. 4, a resource grid consists of N_(RB) ^(μ)N_(sc) ^(RB)subcarriers on a frequency domain, each subframe consisting of 14·2μOFDM symbols, but the present disclosure is not limited thereto.

In the NR system, a transmitted signal is described by one or moreresource grids, consisting of N_(RB) ^(μ)N_(sc) ^(RB) subcarriers, and2^(μ)N_(symb) ^((μ)) OFDM symbols, where N_(RB) ^(μ)≤N_(RB) ^(max,μ).N_(RB) ^(max,μ) denotes a maximum transmission bandwidth and may changenot only between numerologies but also between uplink and downlink.

In this case, as illustrated in FIG. 5, one resource grid may beconfigured per numerology μ and antenna port p.

FIG. 5 illustrates examples of a resource grid per antenna port andnumerology to which a method proposed in the present disclosure isapplicable.

Each element of the resource grid for the numerology μ and the antennaport p is called a resource element and is uniquely identified by anindex pair (k,l) where k=0, . . . , N_(RB) ^(μ)N_(sc) ^(RB)—−1 is anindex on a frequency domain, and l0, . . . , 2^(μ)N_(symb) ^((μ))−1refers to a location of a symbol in a subframe. The index pair (k,l) isused to refer to a resource element in a slot, where l=0, . . . ,N_(symb) ^(μ)−1.

The resource element (k, 1 ) for the numerology μ and the antenna port pcorresponds to a complex value d_(k,l) ^((p,μ)). When there is no riskfor confusion or when a specific antenna port or numerology is notspecified, the indexes p and μ may be dropped, and as a result, thecomplex value may be a_(k,l) ^((p)) or a_(k,l) .

Further, a physical resource block is defined as N_(sc) ^(RB)=12consecutive subcarriers in the frequency domain.

Point A serves as a common reference point of a resource block grid andmay be obtained as follows.

-   -   offsetToPointA for PCell downlink represents a frequency offset        between the point A and a lowest subcarrier of a lowest resource        block that overlaps a SS/PBCH block used by the UE for initial        cell selection, and is expressed in units of resource blocks        assuming 15 kHz subcarrier spacing for FR1 and 60 kHz subcarrier        spacing for FR2.    -   absoluteFrequencyPointA represents frequency-location of the        point A expressed as in absolute radio-frequency channel number        (ARFCN).

The common resource blocks are numbered from 0 and upwards in thefrequency domain for subcarrier spacing configuration μ.

The center of subcarrier 0 of common resource block 0 for the subcarrierspacing configuration μ coincides with ‘point A’. A common resourceblock number n_(CRB) ^(μ) in the frequency domain and resource elements(k, l) for the subcarrier spacing configuration μ may be given by thefollowing Equation 1.

$\begin{matrix}{n_{CRB}^{\mu} = \left\lfloor \frac{k}{N_{sc}^{RB}} \right\rfloor} & \left\lbrack {{Equation}1} \right\rbrack\end{matrix}$

Here, k may be defined relative to the point A so that k=0 correspondsto a subcarrier centered around the point A. Physical resource blocksare defined within a bandwidth part (BWP) and are numbered from 0 toN_(BWP,i) ^(size)−1, where i is No. of the BWP. A relation between thephysical resource block n_(PRB) in BWP i and the common resource blockn_(CRB) may be given by the following Equation 2.

n _(CRB) =n _(PRB) +N _(BWP,i) ^(start)  [Equation 2]

Here, N_(BWP,i) ^(start) may be the common resource block where the BWPstarts relative to the common resource block 0.

Physical Channel and General Signal Transmission

FIG. 6 illustrates physical channels and general signal transmissionused in a 3GPP system. In a wireless communication system, the UEreceives information from the eNB through Downlink (DL) and the UEtransmits information from the eNB through Uplink (UL). The informationwhich the eNB and the UE transmit and receive includes data and variouscontrol information and there are various physical channels according toa type/use of the information which the eNB and the UE transmit andreceive.

When the UE is powered on or newly enters a cell, the UE performs aninitial cell search operation such as synchronizing with the eNB (S601).To this end, the UE may receive a Primary Synchronization Signal (PSS)and a (Secondary Synchronization Signal (SSS) from the eNB andsynchronize with the eNB and acquire information such as a cell ID orthe like. Thereafter, the UE may receive a Physical Broadcast Channel(PBCH) from the eNB and acquire in-cell broadcast information.Meanwhile, the UE receives a Downlink Reference Signal (DL RS) in aninitial cell search step to check a downlink channel status.

A UE that completes the initial cell search receives a Physical DownlinkControl Channel (PDCCH) and a Physical Downlink Control Channel (PDSCH)according to information loaded on the PDCCH to acquire more specificsystem information (S602).

Meanwhile, when there is no radio resource first accessing the eNB orfor signal transmission, the UE may perform a Random Access Procedure(RACH) to the eNB (S603 to S606). To this end, the UE may transmit aspecific sequence to a preamble through a Physical Random Access Channel(PRACH) (S603 and S605) and receive a response message (Random AccessResponse (RAR) message) for the preamble through the PDCCH and acorresponding PDSCH. In the case of a contention based RACH, aContention Resolution Procedure may be additionally performed (S606).

The UE that performs the above procedure may then perform PDCCH/PDSCHreception (S607) and Physical Uplink Shared Channel (PUSCH)/PhysicalUplink Control Channel (PUCCH) transmission (S608) as a generaluplink/downlink signal transmission procedure. In particular, the UE mayreceive Downlink Control Information (DCI) through the PDCCH. Here, theDCI may include control information such as resource allocationinformation for the UE and formats may be differently applied accordingto a use purpose.

Meanwhile, the control information which the UE transmits to the eNBthrough the uplink or the UE receives from the eNB may include adownlink/uplink ACK/NACK signal, a Channel Quality Indicator (CQI), aPrecoding Matrix Index (PMI), a Rank Indicator (RI), and the like. TheUE may transmit the control information such as the CQI/PMI/RI, etc.,through the PUSCH and/or PUCCH.

CSI Related Operation

In a New Radio (NR) system, a channel state information-reference signal(CSI-RS) is used for time and/or frequency tracking, CSI computation,layer 1 (L1)-reference signal received power (RSRP) computation, andmobility. Here, the CSI computation is related to CSI acquisition, andL1-RSRP computation is related to beam management (BM).

Channel state information (CSI) collectively refers to information thatmay indicate the quality of a radio channel (or referred to as a link)formed between the UE and the antenna port.

FIG. 7 is a flowchart illustrating an example of a CSI relatedprocedure.

Referring to FIG. 7, in order to perform one of usages of the CSI-RS, aterminal (e.g., user equipment (UE)) receives, from a base station(e.g., general Node B or gNB), configuration information related to theCSI through radio resource control (RRC) signaling (step S710).

The configuration information related to the CSI may include at leastone of CSI-interference management (IM) resource related information,CSI measurement configuration related information, CSI resourceconfiguration related information, CSI-RS resource related information,or CSI report configuration related information.

The CSI-IM resource related information may include CSI-IM resourceinformation, CSI-IM resource set information, and the like. The CSI-IMresource set is identified by a CSI-IM resource set identifier (ID), andone resource set includes at least one CSI-IM resource. Each CSI-IMresource is identified by a CSI-IM resource ID.

The CSI resource configuration related information may be expressed asCSI-ResourceConfig IE. The CSI resource configuration relatedinformation defines a group including at least one of a non-zero power(NZP) CSI-RS resource set, a CSI-IM resource set, or a CSI-SSB resourceset. In other words, the CSI resource configuration related informationmay include a CSI-RS resource set list and the CSI-RS resource set listmay include at least one of a NZP CSI-RS resource set list, a CSI-IMresource set list, or a CSI-SSB resource set list. The CSI-RS resourceset is identified by a CSI-RS resource set ID, and one resource setincludes at least one CSI-RS resource. Each CSI-RS resource isidentified by a CSI-RS resource ID.

Table 5 represents an example of NZP CSI-RS resource set IE. Asrepresented in Table 5, parameters (e.g., a BM related ‘repetition’parameter and a tracking related ‘trs-Info’ parameter) representing theusage of CSI-RS may be configured for each NZP CSI-RS resource set.

TABLE 5  -- ASN1START  -- TAG-NZP-CSI-RS-RESOURCESET-START NXP-CSI-RS-ResourceSet ::= SEQUENCE {   nzp-CSI-ResourceSetId NZP-CSI-RS-ResourceSetId,   nzp-CSI-RS-Resources  SEQUENCE {SIZE (1..maxNrofNZP-CSI-RS-ResourcePerSet)) OF NZP-CSI-RS-ResourceId,  repitition  ENUMERATED { on, off }   aperiodicTriggeringOffset INTEGER(0..4)   trs-Info  ENUMERATED {true}   ...  } -- TAG-NZP-CSI-RS-RESOURCESET-STOP  -- ASN1STOP

In addition, the repetition parameter corresponding to the higher layerparameter corresponds to ‘CSI-RS-ResourceRep’ of L1 parameter.

The CSI report configuration related information includes areportConfigType parameter representing a time domain behavior and areportQuantity parameter representing a CSI related quantity forreporting. The time domain behavior may be periodic, aperiodic, orsemi-persistent.

The CSI report configuration related information may be expressed asCSI-ReportConfig IE, and Table 6 below represents an example ofCSI-ReportConfig IE.

TABLE 6  -- ASN1START  -- TAG-CSI-RESOURCECONFIG-START CSI-ReportConfig ::= SEQUENCE {   reportConfigId  CSI-ReportConfigId,  carrier  ServCellIndex OPTIONAL, - - Need S  resourcesForChannelMeasurement   CSI-ReportConfigId,  csi-IM-ResourcesForInterference   CSI-ReportConfigId OPTIONAL, -- Need R   nzp-CSI-RS-ResourcesForInterference   CSI-ReportConfigIdOPTIONAL, - - Need R   reportConfigType  CHOICE {    periodic   SEQUENCE {     reportSlotConfig     CSI- ReportPeriodicityAndOffset,    pucch-CSI-ResourceList      SEQUENCE (SIZE(1..maxNrofBWPs)) OF PUCCH-CSI-Resource    },    semiPersistantOnPUCCH   SEQUENCE {     reportSlotConfig     CSI- ReportPeriodicityAndOffset,    pucch-CSI-ResourceList      SEQUENCE (SIZE (1..maxNrofBWPs)) OF PUCCH-CSI-Resource    },    semiPersistantOnPUSCH   SEQUENCE {     reportSlotConfig     ENUMERATED {s15, s110, s120, s140, s180, s1160, s1320},     reportSlotOffsetList   SEQUENCE (SIZE (1.. maxNrofUL- Allocations)) OF INTEGER (0..32),    p0alpha     P0-PUSCH-AlphaSetId    },    aperiodic    SEQUENCE {    reportSlotOffsetList    SEQUENCE (SIZE (1..maxNrofUL-Allocations)) OF INTEGER (0..32)    }   },   reportQuantity  CHOICE {   none    NULL,    cri-RI-PMI-CQI    NULL,    cri-RI-i1    NULL,   cri-RI-i1-CQI    SEQUENCE {     pdsch-BundleSizeForCSI     ENUMERATED {n2, n4}  OPTIONAL    },    cri-RI-CQI    NULL,   cri-RSRP    NULL,    ssb-Index-RSRP    NULL,    cri-RI-LI-PMI-CQI   NULL   },

The UE measures CSI based on configuration information related to theCSI (step S720). The CSI measurement may include (1) a CSI-RS receptionprocess of the UE (step S721) and (2) a process of computing the CSIthrough the received CSI-RS (step S722), and a detailed descriptionthereof will be described below.

For the CSI-RS, resource element (RE) mapping of a CSI-RS resource isconfigured time and frequency domains by higher layer parameterCSI-RS-ResourceMapping.

Table 7 represents an example of CSI-RS-ResourceMapping IE.

TABLE 7   -- ASN1START  -- TAG-CSI-RS-RESOURCEMAPPING-START CSI-RS-ResourceMapping ::= SEQUENCE {   frequencyDomainAllocation CHOICE {    row1   BIT STRING (SIZE 4)),    row2  BIT STRING (SIZE 12)),    row4   BIT STRING (SIZE 3)),    other  BIT STRING (SIZE 6))   },   nrofPorts  ENUMERATED {p1, p2, p4, p8, p12, p16, p24, p32},   firstOFDMSymbolInTimeDomain  INTEGER (0..13)  firstOFDMSymbolInTimeDomain2  INTEGER (2..12)   cdm-Type ENUMERATED {noCDM, fd-CDM2,  cdm4-FD2-TD2, cdm8-FD2-TD4},   density CHOICE {    dot5   ENUMERATED {evenPRBs, oddPRBs},    one   NULL,   three   NULL,    spare   NULL   },   freqBand CSI-FrequencyOccupation,   ...  }

In Table 7, a density (D) represents a density of the CSI-RS resourcemeasured in RE/port/physical resource block (PRB), and nrofPortsrepresents the number of antenna ports.

The UE reports the measured CSI to the BS (step S730).

Here, in the case that a quantity of CSI-ReportConfig of Table 7 isconfigured to ‘none (or No report)’, the UE may skip the report.

However, even in the case that the quantity is configured to ‘none (orNo report)’, the UE may report the measured CSI to the BS.

The case where the quantity is configured to ‘none (or No report)’ is acase of triggering aperiodic TRS or a case where repetition isconfigured.

Here, only in the case where the repetition is configured to ‘ON’, thereport of the UE may be skipped.

CSI Measurement

The NR system supports more flexible and dynamic CSI measurement andreporting. Here, the CSI measurement may include a procedure ofacquiring the CSI by receiving the CSI-RS and computing the receivedCSI-RS.

As time domain behaviors of the CSI measurement and reporting,aperiodic/semi-persistent/periodic channel measurement (CM) andinterference measurement (IM) are supported. A 4 port NZP CSI-RS REpattern is used for configuring the CSI-IM.

CSI-IM based IMR of the NR has a similar design to the CSI-IM of the LTEand is configured independently of ZP CSI-RS resources for PDSCH ratematching. In addition, in NZP CSI-RS based IMR, each port emulates aninterference layer having (a preferable channel and) precoded NZPCSI-RS. This is for intra-cell interference measurement with respect toa multi-user case and primarily targets MU interference.

The BS transmits the precoded NZP CSI-RS to the UE on each port of theconfigured NZP CSI-RS based IMR.

The UE assumes a channel/interference layer for each port and measuresinterference.

In respect to the channel, when there is no PMI and RI feedback,multiple resources are configured in a set, and the BS or the networkindicates a subset of NZP CSI-RS resources through the DCI with respectto channel/interference measurement.

Resource setting and resource setting configuration will be described inmore detail.

Resource Setting

Each CSI resource setting ‘CSI-ResourceConfig’ includes a configurationfor S≥1 CSI resource set (given by higher layer parametercsi-RS-ResourceSetList). The CSI resource setting corresponds to theCSI-RS-resourcesetlist. Here, S represents the number of configuredCSI-RS resource sets. Here, the configuration for S≥1 CSI resource setincludes each CSI resource set including CSI-RS resources (constitutedby NZP CSI-RS or CSI IM) and an SS/PBCH block (SSB) resource used forL1-RSRP computation.

Each CSI resource setting is positioned in a DL BWP (bandwidth part)identified by a higher layer parameter bwp-id. In addition, all CSIresource settings linked to CSI reporting setting have the same DL BWP.

A time domain behavior of the CSI-RS resource within the CSI resourcesetting included in CSI-ResourceConfig IE is indicated by higher layerparameter resourceType and may be configured to be aperiodic, periodic,or semi-persistent. The number S of configured CSI-RS resource sets islimited to ‘1’ with respect to periodic and semi-persistent CSI resourcesettings. Periodicity and slot offset which are configured are given innumerology of associated DL BWP as given by bwp-id with respect to theperiodic and semi-persistent CSI resource settings.

When the UE is configured as multiple CSI-ResourceConfigs including thesame NZP CSI-RS resource ID, the same time domain behavior is configuredwith respect to CSI-ResourceConfig.

When the UE is configured as multiple CSI-ResourceConfigs including thesame CSI-IM resource ID, the same time domain behavior is configuredwith respect to CSI-ResourceConfig.

Next, one or more CSI resource settings for channel measurement (CM) andinterference measurement (I M) are configured through higher layersignaling.

-   -   CSI-IM resource for interference measurement.    -   NZP CSI-RS resource for interference measurement.    -   NZP CSI-RS resource for channel measurement.

That is, channel measurement resource (CMR) may be NZP CSI-RS andinterference measurement resource (IMR) may be NZP CSI-RS for CSI-IM andIM.

Here, CSI-IM (or ZP CSI-RS for IM) is primarily used for inter-cellinterference measurement.

In addition, NZP CSI-RS for IM is primarily used for intra-cellinterference measurement from multi-users.

The UE may assume CSI-RS resource(s) for channel measurement andCSI-IM/NZP CSI-RS resource(s) for interference measurement configuredfor one CSI reporting are ‘QCL-TypeD’ for each resource.

Resource Setting Configuration

As described, the resource setting may mean a resource set list.

In each trigger state configured by using higher layer parameterCSI-AperiodicTriggerState with respect to aperiodic CSI, eachCSI-ReportConfig is associated with/related to one or multipleCSI-ReportConfigs linked to the periodic, semi-persistent, or aperiodicresource setting.

One reporting setting may be connected with a maximum of three resourcesettings.

-   -   When one resource setting is configured, the resource setting        (given by higher layer parameter resourcesForChannelMeasurement)        is used for channel measurement for L1-RSRP computation.    -   When two resource settings are configured, a first resource        setting (given by higher layer parameter        resourcesForChannelMeasurement) is used for channel measurement        and a second resource setting (given by        csi-IM-ResourcesForinterference or        nzp-CSI-RS-ResourcesForinterference) is used for interference        measurement performed on CSI-IM or NZP CSI-RS.    -   When three resource settings are configured, a first resource        setting (given by resourcesForChannelMeasurement) is for channel        measurement, a second resource setting (given by        csi-IM-ResourcesForinterference) is for CSI-IM based        interference measurement, and a third resource setting (given by        nzp-CSI-RS-ResourcesForinterference) is for NZP CSI-RS based        interference measurement.

Each CSI-ReportConfig is linked to periodic or semi-persistent resourcesetting with respect to semi-persistent or periodic CSI.

-   -   When one resource setting (given by        resourcesForChannelMeasurement) is configured, the resource        setting is used for channel measurement for L1-RSRP computation.    -   When two resource settings are configured, a first resource        setting (given by resourcesForChannelMeasurement) is used for        channel measurement and a second resource setting (given by        higher layer parameter csi-IM-ResourcesForinterference) is used        for interference measurement performed on CSI-IM.

CSI Computation

When interference measurement is performed on CSI-IM, each CSI-RSresource for channel measurement is associated with/related to theCSI-IM resource for each resource by an order of CSI-RS resources andCSI-IM resources within a corresponding resource set. The number ofCSI-RS resources for channel measurement is equal to the number ofCSI-IM resources.

In addition, when the interference measurement is performed in the NZPCSI-RS, the UE does not expect to be configured as one or more NZPCSI-RS resources in the associated resource set within the resourcesetting for channel measurement.

A UE in which Higher layer parameter nzp-CSI-RS-ResourcesForinterferenceis configured does not expect that 18 or more NZP CSI-RS ports will beconfigured in the NZP CSI-RS resource set.

For CSI measurement, the UE assumes the followings.

-   -   Each NZP CSI-RS port configured for interference measurement        corresponds to an interference transport layer.    -   In all interference transport layers of the NZP CSI-RS port for        interference measurement, an energy per resource element (EPRE)        ratio is considered.    -   Different interference signals on RE(s) of the NZP CSI-RS        resource for channel measurement, the NZP CSI-RS resource for        interference measurement, or CSI-IM resource for interference        measurement.

CSI Reporting

For CSI reporting, time and frequency resources which may be used by theUE are controlled by the BS.

The channel state information (CSI) may include at least one of achannel quality indicator (CQI), a precoding matrix indicator (PMI), aCSI-RS resource indicator (CRI), an SS/PBCH block resource indicator(SSBRI), a layer indicator (LI), a rank indicator (RI), and L1-RSRP.

For the CQI, PMI, CRI, SSBRI, LI, RI, and L1-RSRP, the UE is configuredby a higher layer as N≥1 CSI-ReportConfig reporting setting, M≥1CSI-ResourceConfig resource setting, and a list (provided byaperiodicTriggerStateList and semiPersistentOnPUSCH) of one or twotrigger states. In the aperiodicTriggerStateList, each trigger stateincludes the channel and an associated CSI-ReportConFIGS list optionallyindicating resource set IDs for interference. In thesemiPersistentOnPUSCH-TriggerStateList, each trigger state includes oneassociated CSI-ReportConfig.

In addition, the time domain behavior of CSI reporting supportsperiodic, semi-persistent, and aperiodic.

i) The periodic CSI reporting is performed on short PUCCH and longPUCCH. The periodicity and slot offset of the periodic CSI reporting maybe configured as RRC and refer to the CSI-ReportConfig IE.

ii) Semi-periodic (SP) CSI reporting is performed on short PUCCH, longPUCCH, or PUSCH.

In the case of SP CSI on the short/long PUCCH, the periodicity and theslot offset are configured as the RRC and the CSI reporting to separateMAC CE/DCI is activated/deactivated.

In the case of the SP CSI on the PUSCH, the periodicity of the SP CSIreporting is configured through the RRC, but the slot offset is notconfigured through the RRC, and the SP CSI reporting isactivated/deactivated by DCI (format 0_1). Separated RNTI (SP-CSIC-RNTI) is used with respect to the SP CSI reporting on the PUSCH.

An initial CSI reporting timing follows a PUSCH time domain allocationvalue indicated in the DCI and a subsequent CSI reporting timing followsa periodicity configured through the RRC.

DCI format 0_1 may include a CSI request field and mayactivate/deactivate a specific configured SP-CSI trigger state. The SPCSI reporting has the same or similar activation/deactivation as amechanism having data transmission on SPS PUSCH.

iii) The aperiodic CSI reporting is performed on the PUSCH and istriggered by the DCI. In this case, information related to trigger ofaperiodic CSI reporting may be transferred/indicated/configured throughMAC-CE.

In the case of AP CSI having AP CSI-RS, an AP CSI-RS timing isconfigured by the RRC and a timing for AP CSI reporting is dynamicallycontrolled by the DCI.

The NR does not adopt a scheme (for example, transmitting RI, WBPMI/CQI, and SB PMI/CQI in order) of dividing and reporting the CSI inmultiple reporting instances applied to PUCCH based CSI reporting in theLTE. Instead, the NR restricts specific CSI reporting not to beconfigured in the short/long PUCCH and a CSI omission rule is defined.In addition, in relation with the AP CSI reporting timing, a PUSCHsymbol/slot location is dynamically indicated by the DCI. In addition,candidate slot offsets are configured by the RRC. For the CSI reporting,slot offset (Y) is configured for each reporting setting. For UL-SCH,slot offset K2 is configured separately.

Two CSI latency classes (low latency class and high latency class) aredefined in terms of CSI computation complexity. The low latency CSI is aWB CSI that includes up to 4 ports Type-I codebook or up to 4-portsnon-PMI feedback CSI. The high latency CSI refers to CSI other than thelow latency CSI. For a normal UE, (Z, Z′) is defined in a unit of OFDMsymbols. Here, Z represents a minimum CSI processing time from thereception of the aperiodic CSI triggering DCI to the execution of theCSI reporting. Further, Z′ represents a minimum CSI processing time fromthe reception of the CSI-RS for channel/interference to the execution ofthe CSI reporting.

Additionally, the UE reports the number of CSIs which may besimultaneously calculated.

Table 8 below is related to the CSI reporting configuration defined inTS38.214.

In addition, Table 9 below is information related toactivation/deactivation/trigger by MAC-CE related toSemi-Persistent/Aperiodic CSI reporting defined in TS38.321.

TABLE 9 5.18.2 Activation/Deactivation of Semi-persistent CSI-RS/CSI-IMresource set The network may activate and deactivate the configuredSemi-persistcnt CSI-RS/CSI-IM resource sets of a Serving Cell by sendingthe SP CSI-RS/CSI-IM Resource Set Activation/Deactivation MAC CEdescribed in subclause 6.1.3.12. The configured Semi-persistentCSI-RS/CSI-IM resource sets are initially deactivated upon configurationand after a handover. The MAC entity shall: 1> if the MAC entityreceives an SP CSI-RS/CSI-IM Resource Set Activation/Deactivation MAC CEon a Serving Cell: 2> indicate to lower layers the information regardingtire SP CSI-RS/CSI-IM Resource Set Activation/Deactivation MAC CE.5.18.3 Aperiodic CSI Trigger State subselection The network may selectamong the configured aperiodic CSI trigger states of a Serving Cell bysending the Aperiodic CSI Trigger State Subselection MAC CE described insubclause 6.1.3.13. The MAC entity shall: 1> if the MAC entity receivesan Aperiodic CSI trigger State Subselection MAC CE on a Serving Cell: 2>indicate to lower layers the information regarding Aperiodic CSI triggerState Subselection MAC CE.

CSI Reporting Using PUSCH

Aperiodic CSI reporting performed in PUSCH supports broadband andsub-band frequency segmentation. The aperiodic CSI reporting performedin the PUSCH supports Type I and Type II CSI.

SP CSI reporting for PUSCH supports type I and type II CSI having wideband and subband frequency granularity. The PUSCH resource andmodulation and coding scheme (MCS) for the SP CSI reporting aresemi-permanently allocated by UL DCI.

CSI reporting for PUSCH may include part 1 and part 2. Part 1 is used toidentify the number of information bits in Part 2. Part 1 is fullydelivered before Part 2.

-   -   In relation to type I CSI feedback, Part 1 includes (if        reported) RI, (if reported) CRI, and CQI of the first codeword.        Part 2 includes PMI, and when RI>4, Part 2 includes CQI.    -   For Type II CSI feedback, Part 1 has a fixed payload size and        includes an indication (NIND) indicating the number of non-zero        wideband amplitude coefficients for each layer of RI, CQI and        Type II CSI. The part 2 includes the PMI of the Type II CSI.        Part 1 and 2 are encoded independently.

When CSI reporting includes two parts in PUSCH and the CSI payload issmaller than the payload size provided by the PUSCH resource allocatedfor CSI reporting, the UE may omit part of the second CSI. Omission ofPart 2 CSI is determined according to priorities shown in Table 10, andpriority 0 is the highest priority and 2N_(Rep) is the lowest priority.Here, NRep denotes the number of CSI reportings in one slot.

TABLE 10 Priority 0: Part 2 wideband CSI for CSI reports 1 to N_(Rep)Priority 1: Part 2 subband CSI of even subbands for CSI report 1Priority 2: Part 2 subband CSI of odd subbands for CSI report 1 Priority3: Part 2 subband CSI of even subbands for CSI report 2 Priority 4: Part2 subband CSI of odd subbands for CSI report 2 Priority 2N_(Rep) − 1:Part 2 subband CSI of even subbands for CSI report N_(Rep) Priority2N_(Rep): Part 2 subband CSI of odd subbands for CSI report N_(Rep)

When Part 2 CSI information for a specific priority level is omitted,the UE omits all information of the corresponding priority level.

When the UE is scheduled to transmit a transport block on PUSCHmultiplexed with CSI reporting, Part 2 CSI is omitted only when the UCIcode rate for transmitting all Part 2 is greater than the threshold coderate

$c_{T} = {\frac{c_{MCS}}{\beta_{offset}^{{CSI} - 2}}.}$

Here, c_(MCS) denotes a target PUSCH code rate, and β_(offset) ^(CSI-2)denotes a CSI offset value.

Part 2 CSI is omitted level by level, starting with the lowest-prioritylevel and the lowest-priority level until the UCI code ratio is lessthan or equal to c_(T).

When part 2 CSI is transmitted on PUSCH without a transport block, thelower priority bit is omitted until the part 2 CSI code ratio is lessthan a threshold code rate

$c_{T} = {\frac{\beta_{offset}^{{CSI} - {{part}1}}}{\beta_{offset}^{{CSI} - {{part}2}}} \cdot r_{{CSI}1}}$

lower than 1. Here, β_(offset) ^(CSI-part)1 and β_(offset) ^(CSI-part)2denotes a CSI offset value, and R_(CSI-1) is based on a code ratecalculated by the UE or signaled by DCI.

CSI Reporting Using PUCCH

The UE may be configured with a number of periodic CSI reportingcorresponding to the CSI reporting configuration indication configuredwith one or more higher layers. Here, the associated CSI measurementlink and CSI resource configuration are configured as a higher layer.

In PUCCH formats 2, 3, or 4, periodic CSI reporting supports type I CSIbased on a wide bandwidth.

Regarding the SP CSI on the PUSCH, the UE performs SP CSI reporting forthe PUCCH in slot n+3N_(slot) ^(subframe,μ)+1 after the HARQ-ACKcorresponding to the PDSCH carrying the selection command is transmittedin a slot n.

The selection command includes one or more report setting indications inwhich the associated CSI resource settings are configured.

In the PUCCH, the SP CSI report supports the Type I CSI.

The SP CSI report of PUCCH format 2 supports type I CSI with widebandwidth frequency granularity. In the PUCCH format 3 or 4, the SP CSIreport supports the type I sub-band CSI and type II CSI with thewideband frequency granularity.

When PUCCH carries type I CSI with wide bandwidth frequency granularity,the CSI payload carried by PUCCH format 2 and PUCCH format 3 or 4 is thesame as CRI (when reported) regardless of RI.

In PUCCH format 3 or 4, the type I CSI subband payload is divided intotwo parts.

The first part (Part 1) includes the RI, (reported) CRI and (reported)CQI of the first code word. The second part (Part 2) includes the PMI,and when RI>4, the second part (Part 2) includes the CQI of the secondcode word.

SP CSI reporting performed in PUCCH format 3 or 4 supports type II CSIfeedback, but only supports part 1 of type II CSI feedback.

In PUCCH format 3 or 4 supporting type II CSI feedback, CSI reportingmay depend on UE performance.

Type II CSI reporting delivered in PUCCH format 3 or 4 (of which onlyPart 1 is applicable) is calculated independently of type II CSIreporting performed in PUSCH.

When the UE is configured with the CSI reporting in the PUCCH format 2,3 or 4, each PUCCH resource is configured for each candidate UL BWP.

When the UE receives the active SP CSI reporting configuration on thePUCCH and does not receive a deactivation command, the CSI reporting isperformed when the CSI reported BWP is the active BWP, otherwise the CSIreporting is temporarily stopped. This operation also applies to thecase of SP CSI of PUCCH. For PUSCH-based SP CSI reporting, thecorresponding CSI reporting is automatically deactivated when BWPswitching occurs.

According to the length of PUCCH transmission, the PUCCH format may beclassified into a short PUCCH or a long PUCCH. The PUCCH formats 0 and 2may be referred to as short PUCCHs, and the PUCCH formats 1, 3 and 4 maybe referred to as long PUCCHs.

With respect to the PUCCH-based CSI reporting, the short PUCCH-based CSIreporting and the long PUCCH-based CSI reporting will be described indetail below.

The short PUCCH-based CSI reporting is used only for wideband CSIreporting. The short PUCCH-based CSI reporting has the same payloadregardless of the RI/CRI of the given slot to avoid blind decoding.

The size of the information payload may be different between the maximumCSI-RS ports of the CSI-RS configured in the CSI-RS resource set.

When the payload including PMI and CQI is diversified to include RI/CQI,a padding bit is added to RI/CRI/PMI/CQI before the encoding procedurefor equalizing the payload associated with/related to different RI/CRIvalues. In addition, RI/CRI/PMI/CQI may be encoded with a padding bit ifnecessary.

In the case of the wideband reporting, the long PUCCH-based CSIreporting may use the same solution as the short PUCCH-based CSIreporting.

The long PUCCH-based CSI reporting uses the same payload regardless ofRI/CRI. For subband reporting, two-part encoding (for type I) isapplied.

Part 1 may have a fixed payload according to the number of ports, CSItype, RI limitation, etc., and Part 2 may have various payload sizesaccording to Part 1.

The CSI/RI may be encoded first to determine the payload of PMI/CQI. Inaddition, CQIi (i=1,2) corresponds to the CQI for the i-th code word(CW).

For the long PUCCH, Type II CSI report may convey only Part 1.

Uplink Power Control [TS38.213, TS38.321, TS38.331, TS38.101]

In a wireless communication system, it may be necessary to increase ordecrease the transmission power of a terminal (for example, UserEquipment, UE) and/or a mobile device depending on the situation. Asmentioned above, controlling the transmission power of a terminal and/ora mobile device may be referred to as uplink power control. As anexample, a transmission power control method may be applied to satisfythe requirements (for example, Signal-to-Noise Ratio (SNR), Bit ErrorRatio (BER), or Block Error Ratio (BLER)) of a base station (forexample, gNB or eNB).

The power control described above may be performed according to theopen-loop power control method or the closed-loop power control method.

Specifically, the open-loop power control method controls transmissionpower without feedback from a transmitting device (for example, a BS) toa receiving device (for example, a UE) and/or without feedback from thereceiving device to the transmitting device. For example, the UE mayreceive a pilot channel/signal from the BS and estimate the strength ofthe received power using the received pilot channel/signal. Afterward,the UE may control the transmission power using the estimated strengthof the received power.

Different from the open-loop power control method above, the closed-looppower control method controls transmission power based on the feedbackfrom the transmitting device to the receiving device and/or based on thefeedback from the receiving device to the transmitting device. Forexample, the BS receives a pilot channel/signal from the UE and, basedon the power level, SNR, BER, or BLER measured using the received pilotchannel/signal, determines the optimum power level of the UE. The BS maytransmit information (namely, feedback) on the determined optimum powerlevel to the UE through a control channel, and the UE may controltransmission power using the feedback provided by the BS.

In what follows, power control methods for cases in which a UE and/or amobile device performs uplink transmission to a BS in a wirelesscommunication system will be described in detail. From now on, powercontrol methods for transmission of 1) an uplink data channel (forexample, Physical Uplink Shared Channel (PUSCH)) and 2) an uplinkcontrol channel (for example, Physical Uplink Control Channel (PUCCH))will be described. At this time, a transmission occasion for PUCCHand/or PUCCH (namely, a transmission time unit) (i) may be defined bythe slot index n_(s), the first symbol S within a slot, or the number ofconsecutive symbols L within a frame with a specific system frame number(SFN).

Power Control of Uplink Data Channel

In what follows, for the convenience of descriptions, the power controlmethod is described based on the assumption that the UE performs PUSCHtransmission. However, it should be noted that the corresponding methodmay be extended to be applied to other types of uplink data channelssupported in a wireless communication system.

In the case of PUSCH transmission in an active UL bandwidth part (ULBWP) of a carrier (f) in a serving cell (c), the UE may calculate alinear power value of the transmission power determined by Eq. 3 below.Afterward, the corresponding UE may control the transmission power basedon the calculated linear power value by considering the number ofantenna ports and/or SRS ports.

Specifically, when the UE performs PUSCH transmission in the active ULBWP (b) of the carrier (f) in the serving cell (c) using a parameter setconfiguration based on the index j and a PUSCH power control adjustmentstate based on the index l, the UE may determine the PUSCH transmissionpower P_(PUSCH,b,f,c)(i,j,q_(d),l) dBm for the PUSCH transmissionoccasion (i) based on Eq. 3 below.

$\begin{matrix}{{P_{{PUSCH},b,f,c}\left( {i,j,q_{d},l} \right)} = {\min{\begin{Bmatrix}{{P_{{CMAX},f,}(i)},} \\\begin{matrix}{{P_{\text{?}}(j)} + {10\log_{10}\left( {{2^{\mu} \cdot M_{\text{?}}^{PUSCH}}(i)} \right)} +} \\{{\alpha_{\text{?}}{(j) \cdot {PL}_{b,f,c}}\left( q_{d} \right)} + {\Delta_{\text{?}}(i)} + {f_{b,f,c}\left( {i,l} \right)}}\end{matrix}\end{Bmatrix}\lbrack{dBm}\rbrack}}} & \left\lbrack {{Eq}.3} \right\rbrack\end{matrix}$ ?indicates text missing or illegible when filed

In Eq. 3, the index j represents the index for the open-loop powercontrol parameter (for example, P_(O), α), and a maximum of 32 parametersets may be configured for each cell. The index q_(d) represents theindex of a DL RS resource for pathloss (PL) measurement (for example,PL_(b,f,c)(q_(d))), and a maximum of 4 measurements may be configuredfor each cell. The index l represents the closed-loop power controlprocess index, and a maximum of 2 processes may be configured for eachcell.

Specifically, P_(O) (for example, P_(O_PUSCH,b,f,c)(j)) is the parameterbroadcast as part of system information and may represent the targetreceived power at the receiver side. The corresponding P_(O) value maybe configured by considering the throughput of the UE, the cellcapacity, noise, and/or interference. Also, α (for example,α_(b,f,c)(j)) may represent the ratio for performing compensation forthe path loss. The a may be set to a value ranging from 0 to 1, andaccording to the set value, full pathloss compensation or fractionalpathloss compensation may be performed. In this case, the a value may beconfigured by considering the interference between UEs and/or data rate.

Also, P_(CMAX,f,c)(i) may represent configured UE transmission power.For example, the configured UE transmission power may be interpreted asthe ‘configured maximum UE output power’ defined in the 3GPP TS 38.101-1and/or TS38.101-2. Also, M_(RB,b,f,c) ^(PUSCH)(i) may represent thebandwidth for PUSCH resource allocation expressed by the number ofresource blocks (RBs) for a PUSCH transmission occasion based on thesubcarrier spacing μ. Also, f_(b,f,c)(i,l) related to the PUSCH powercontrol adjustment state may be configured or indicated based on the TPCcommand field of DCI (for example, DCI format 0_0, DCI format 0_1, DCIformat 2_2, or DCI format 2_3).

In this case, a specific Radio Resource Control (RRC) parameter (forexample, SRI-PUSCHPowerControl-Mapping) may represent the SRS ResourceIndicator (SRI) field of downlink control information (DCI) and thelinkage between the indexes j,q_(d), and l. In other words, the indexesj,q_(d), and l may be linked to a beam, a panel, and/or a spatial domaintransmission filter based on specific information. Based on the above,PUSCH transmission power control may be performed in beam, panel, and/orspatial domain transmission filter units.

The parameters and/or information for PUSCH power control may beconfigured separately (namely, independently) for each BWP. In thiscase, the corresponding parameters and/or information may be configuredor indicated through higher layer signaling (for example, RRC signalingor Medium Access Control-Control Element (MAC-CE)) and/or DCI. Forexample, the parameter and/or information for PUSCH power control may bedelivered through RRC signaling PUSCH-ConfigCommon orPUSCH-PowerControl, where PUSCH-ConfigCommon and PUSCH-PowerControl maybe configured as shown in Table 11 below.

TABLE 11   PUSCH-ConfigCommon ::-   SEQUENCE {  groupHoppingEnabledTransformPrecoding       ENUMERATE {enabled}  pusch-TimeDomainAllocationList     PUSCH-TimeDomainResourceAllocationList   msg3-DeltaPreamble    INTEGER (−1..6)   p0-NominalWithGrant     INTEGER (−202..24)   ... }  PUSCH-PowerControl ::= SEQUENCE {   tpc-Accumulation  ENUMERATED { disabled }   msg3-Alpha  Alpha   p0-NominalWithoutGrant   INTEGER (−202..24)   p0-AlphaSets   SEQUENCE (SIZE (1..maxNrofP0-PUSCH-AlphaSets)) OF P0-PUSCH-AlphaSet   pathlossReferenceRSToAddModList        SEQUENCE (SIZE (1..maxNrofPUSCH-PathlossReferenceRSs)) of PUSCH-PathlossReferenceRS  pathlossReferenceRSToReleaseList        SEQUENCE (SIZE (1..maxNrofPUSCH-PathlossReferenceRSs)) OF PUSCH-PathlossReferenceRS-Id  twoPUSCH-PC-AdjustmentStates    ENUMERATED {twoStates}   deltaMCSENUMERATED {enabled}   sri-PUSCH-MappingToAddModList    SEQUENCE (SIZE (1..maxNrofSRI-PUSCH-Mappings)) OF SRI-PUSCH-PowerControl  sri-PUSCH-MappingToReleaseList     SEQUENCE (SIZE (1..maxNrofSRI-PUSCH-Mappings)) OF SRI-PUSCH-PowerControlId  }

Through the method described above, the UE may determine or calculatePUSCH transmission power and may transmit PUSCH using the determined orcalculated PUSCH transmission power.

Power Control of Uplink Control Channel

In what follows, for the convenience of descriptions, the power controlmethod is described based on the assumption that the UE performs PUCCHtransmission. However, it should be noted that the corresponding methodmay be extended to be applied to other types of uplink control channelssupported in a wireless communication system.

Specifically, when the UE performs PUCCH transmission in the active ULBWP (b) of the carrier (f) in the primary cell (or secondary cell) (c)using a PUCCH power control adjustment state based on the index l, theUE may determine the PUCCH transmission power P_(PUCCH,b,f,c)(i, q_(u),q_(d), l) dBm for the PUSCH transmission occasion (i) based on Eq. 4below.

$\begin{matrix}{{P_{{PUCCH},h,f,c}\left( {i,q_{u},q_{d},l} \right)} = {\min{\begin{Bmatrix}{{P_{{CMAX},f}\text{?}(i)},} \\\begin{matrix}\begin{matrix}{{P_{{O\_{PUCCH}},b,f,c}\left( q_{u} \right)} + {10{\log_{10}\left( {2^{u} \cdot {M_{{RB},b,f,c}^{PUCCH}(i)}} \right)}} +} \\{{{PL}_{b,f,c}\left( q_{d} \right)} + {\Delta_{F\_{PUCCH}}(F)} +}\end{matrix} \\{{\Delta_{{TF},b,f,c}(i)} + {g_{b,f,c}\left( {i,l} \right)}}\end{matrix}\end{Bmatrix}\lbrack{dbm}\rbrack}}} & \left\lbrack {{Eq}.4} \right\rbrack\end{matrix}$ ?indicates text missing or illegible when filed

In Eq. 4, q_(u) represents the index for the open-loop power controlparameter (for example, P₀), and a maximum of 8 parameter values may beconfigured for each cell. The index q_(d) represents the index of a DLRS resource for pathloss (PL) measurement (for example,PL_(b,f,c)(q_(d))), and a maximum of 4 measurements may be configuredfor each cell. The index l represents the closed-loop power controlprocess index, and a maximum of 2 processes may be configured for eachcell.

Specifically, P_(O) (for example, P_(O_PUCCH,b,f,c)(q_(u))) is theparameter broadcast as part of system information and may represent thetarget received power at the receiver side. The corresponding P_(O)value may be configured by considering the throughput of the UE, thecell capacity, noise, and/or interference. Also, P_(CMAX,f,c)(i) mayrepresent configured UE transmission power. For example, the configuredUE transmission power may be interpreted as the ‘configured maximum UEoutput power’ defined in the 3GPP TS 38.101-1 and/or TS38.101-2. Also,M_(RB,b,f,c) ^(PUCCH)(i) may represent the bandwidth for PUCCH resourceallocation expressed by the number of resource blocks (RBs) for a PUCCHtransmission occasion based on the subcarrier spacing μ. Also, the deltafunction (for example, Δ_(F_PUCCH)(F), Δ_(TF,b,f,c)(i)) may beconfigured by considering the PUCCH format (for example, PUCCH formats0, 1, 2, 3, 4). Also, g_(b,f,c)(i, l) related to the PUCCH power controladjustment state may be configured or indicated based on the TPC commandfield of DCI (for example, DCI format 1_0, DCI format 1_1, or DCI format2_2) received or detected by the UE.

In this case, a specific RRC parameter (for example,PUCCH-SpatialRelationInfo) and/or a specific MAC-CE command (forexample, PUCCH spatial relation Activation/Deactivation) may be used toactivate or deactivate the connection relationship between a PUCCHresource and the indexes q_(u), q_(d), and l. For example, the PUCCHspatial relation Activation/Deactivation command in the MAC-CE mayactivate or deactivate the connection relationship between a PUCCHresource and the indexes q_(u), q_(d), and l based on the RRC parameterPUCCH-SpatialRelationInfo. In other words, the indexes q_(u), q_(d), andl may be associated with/related to a beam, a panel, and/or a spatialdomain transmission filter based on specific information. Based on theabove, PUCCH transmission power control may be performed in beam, panel,and/or spatial domain transmission filter units.

The parameters and/or information for PUCCH power control may beconfigured separately (namely, independently) for each BWP. In thiscase, the corresponding parameters and/or information may be configuredor indicated through higher layer signaling (for example, RRC signalingor MAC-CE) and/or DCI. For example, the parameter and/or information forPUCCH power control may be delivered through RRC signalingPUCCH-ConfigCommon or PUCCH-PowerControl, where PUCCH-ConfigCommon andPUCCH-PowerControl may be configured as shown in Table 12 below.

TABLE 11  PUCCH-ConfigCommon ::= SEQUENCE {   pucch-ResourceCommon INTEGER (0..15)   pucch-GroupHopping ENUMERATED { neither, enable, disable },   hoppingId INTEGER (0..1023)  p0-nominal INTEGER (−202..24)   ...  }  PUCCH-PowerControl ::=SEQUENCE {   deltaF-PUCCH-f0  INTEGER (−16..15)   deltaF-PUCCH-f1 INTEGER (−16..15)   deltaF-PUCCH-f2  INTEGER (−16..15)  deltaF-PUCCH-f3  INTEGER (−16..15)   deltaF-PUCCH-f4 INTEGER (−16..15)   p0-Set     SEQUENCE (SIZE (1..maxNrofPUCCH-P0-PerSet)) OF P0-PUCCH  pathlossReferenceRSs SEQUENCE (SIZE (1..maxNrofPUCCH-PathlossReferenceRSs)) OF PUCCH-PathlossReferenceRS  twoPUCCH-PC-AdjustmentStates   ENUMERATED {twoStates}   ...  } P0-PUCCH ::= SEQUENCE {   p0-PUCCH-Id   P0-PUCCH-Id,   p0-PUCCH-Value  INTEGER (−16..15)  }  P0-PUCCH-Id ::= INTEGER (1..8) PUCCH-PathlossReferenceRS ::=     SEQUENCE {  pucch-PathlossReferenceRS-Id     PUCCH-PathlossReferenceRS-Id,  referenceSignal    CHOICE {    ssb-Index     SSB-Index,   csi-RS-Index     NZP-CSI-RS-ResourceID   }  }

Through the method described above, the UE may determine or calculatePUCCH transmission power and may transmit PUCCH using the determined orcalculated PUCCH transmission power.

Priority for Transmission Power Control

In what follows, a method for controlling the transmission power of aUE, which considers single-cell operation in the carrier aggregationsituation or single-cell operation in the multiple UL carrier situation(for example, two UL carriers), will be described.

At this time, when the total UE transmit power for uplink transmissions(PUSCH, PUCCH, SRS, and/or PRACH transmission) in each transmissionoccasion (i) exceeds a linear value (for example, {circumflex over(P)}_(CMAX)(i)) of the configured UE transmission power, the UE may beconfigured to allocate power to the uplink transmissions according to apriority order. For example, the configured UE transmission power maymean the ‘configured maximum UE output power’ (for example, P_(CMAX)(i))defined in the 3GPP TS 38.101-1 and/or TS 38.101-2.

At this time, the priority for transmission power control may beconfigured or defined in the following order.

-   -   PRACH transmission in the primary cell (PCell)    -   Hybrid Automatic Repeat and reQuest-Acknowledgement (HARQ-ACK)        information and/or PUCCH for Scheduling Request, or PUSCH for        HARQ-ACK information    -   PUCCH or PUSCH for Channel State Information (CSI)    -   PUSCH not for HARQ-ACK information or CSI    -   SRS transmission (it should be noted that aperiodic SRS has a        higher priority than semi-persistent SRS and/or periodic SRS) or        PRACH transmission in a serving cell rather than the Pcell

Through the priority-based power allocation described above, the UE maycontrol the total transmit power in each symbol of a transmissionoccasion (i) to be less than or equal to the linear value of theconfigured UE transmission power. For example, for this purpose, the UEmay be configured to scale and/or drop the power for uplink transmissionwith a low priority. In this case, specific details for scaling and/ordropping may be configured or defined to conform to UE implementation.

Also, as a specific example, when transmissions in the carrieraggregation situation have the same priority, the UE may consider thetransmission in the Pcell to have a higher priority than thetransmission in the Scell. And/or, when transmission in the multiple ULcarrier situation (for example, two UL carriers) have the same priority,the UE may consider a carrier configured for PUCCH transmission to havea high priority. Also, when PUCCH transmission is not configured for anycarrier, the UE may consider the transmission in a non-supplementary ULcarrier to have a high priority.

Transmission Power Control Procedure

FIG. 8 illustrates an example of a procedure for controlling uplinktransmission power.

First, a UE may receive parameters and/or information related totransmission (Tx) power from a BS S805. In this case, the UE may receivethe corresponding parameters and/or information through higher layersignaling (for example, RRC signaling or MAC-CE). For example, inrelation to PUSCH transmission, PUCCH transmission, SRS transmission,and/or PRACH transmission, the UE may receive parameters and/orinformation related to the transmission power control (for example,Table 11 or Table 12).

Afterward, the UE may receive a TPC command related to the transmissionpower from the BS S810. In this case, the UE may receive thecorresponding TPC command through lower layer signaling (for example,DCI). For example, regarding the PUSCH transmission, the PUCCHtransmission, and/or the SRS transmission, the UE may receiveinformation on the TPC command to determine the power control adjustmentstate as described above through the TPC command field of a predefinedDCI format. However, in the case of PRACH transmission, thecorresponding step may be omitted.

Afterward, the UE may determine (or calculate) the transmission powerfor uplink transmission based on the parameter, information, and/or TPCcommand received from the BS S815. For example, the UE may determine thePUSCH transmission power, the PUCCH transmission power, the SRStransmission power, and/or the PRACH transmission power based on themethod above (for example, Eq. 3 or Eq. 4). And/or when two or moreuplink channels and/or signals need to be transmitted by beingoverlapped with each other as in the carrier aggregation situation, theUE may determine the transmission power for uplink transmission byconsidering the priority described in 5).

Afterward, the UE may perform transmission of one or more uplinkchannels and/or signals (for example, PUSCH, PUCCH, SRS, or PRACH) tothe BS based on the determined (or calculated) transmission power S820.

Power Headroom Report [TS 38.213, TS 38.321, TS 38.331]

The UE performs power headroom report to provide the followinginformation to the BS.

-   -   Type 1 power headroom: Difference between the nominal maximum        transmission power (for example, P_(CMAX)(i) or configured UE        transmission or configured maximum output power of the UE) for        each activated serving cell and the estimated transmission power        of UL-SCH/PUSCH    -   Type 2 power headroom: Difference between the estimated        transmission power of PUCCH and UL-SCH/PUSCH transmitted on the        SpCell of another MAC entity (i.e., E-UTRA MAC entity in EN-DC)        and the nominal maximum transmission power (for example,        P_(CMAX)(i) or configured UE transmission or configured maximum        output power of the UE) in the corresponding SpCell    -   Type 3 power headroom: Difference between the nominal maximum        transmission power (for example, P_(CMAX)(i) or configured UE        transmission or configured maximum output power of the UE) for        each activated serving cell and the estimated transmission power        of SRS

When the UE configures two uplink carriers in a serving cell anddetermines Type 1 power headroom report and Type 3 power headroom reportin the corresponding serving cell,

-   -   the UE may perform the Type 1 power headroom report when the        Type 1 power headroom report and the Type 3 power headroom        report are determined based on actual transmission or reference        transmission. Or,    -   the UE may perform the power headroom report (for example, Type        1 or Type 3) determined based on actual transmission when one of        the Type 1 power headroom report or Type 3 power headroom report        is determined based on reference transmission.

Also, virtual PH in the present disclosure may mean Type 1 powerheadroom, Type 2 power headroom, and/or Type 3 power headroom determinedbased on reference transmission.

Type 1 PH Report

When the UE performs Type 1 power headroom on an activated serving cellbased on actual PUSCH transmission (in the PUSCH transmission occasion(i) on the activated UL BWP (b) of carrier (f) on the serving cell (c)),the Type 1 power headroom (i.e., PH_(type1b,f,c)(i,j,q_(d),l)) may bedetermined by Eq. 5.

PH_(type1,b,f,c)(i,j,q _(d) ,l)=P _(CMAX,f,c)(i)−{P_(O_PUSCH,b,j,c)(j)+10 log₁₀(2^(μ) ·M _(RBb,f,c)^(PUSCH)(i))+α_(b,f,c)(q _(d))+A _(TE,b,f,c)(i)+f_(b,f,c)(i,l)}[dB]  [Eq. 5]

When the UE performs Type 1 power headroom on an activated serving cellbased on reference PUSCH transmission (in the PUSCH transmissionoccasion (i) on the activated UL BWP (b) of carrier (f) on the servingcell (c)), the Type 1 power headroom (i.e., PH_(type1b,f,c)(i,j,q_(d),l)may be determined by Eq. 6.

PH_(type1,b,f,c))={tilde over (P)} _(CMAX,f,c)(i)−{P_(O_PUSCH,b,f,c)(j)+α_(b,f,c)(j)·PL _(b,f,c)(q _(d))+f_(b,f,c)(i,l)}[dB]  [Eq. 6]

Type 3 PH Report

When the UE performs Type 3 power headroom on an activated serving cellbased on actual SRS transmission (in the SRS transmission occasion (i)on the activated UL BWP (b) of carrier (f) on the serving cell (c)), theType 3 power headroom (i.e., PH_(type3b,f,c)(i, q_(s))) may bedetermined by Eq. 7.

PH_(type3,b,f,c)(i,q _(s))=P _(CMAX,f,c)(i)−{P _(O_SRS,b,f,c)(q _(s))−10log₁₀(2^(μ) ·M _(SRS,b,f,c)(i))+α_(SRS,b,f,c)(q _(s))·PL _(b,f,c)(q_(d))+h _(b,f,c)(i)}[dB]  [Eq. 7]

When the UE performs Type 3 power headroom on an activated serving cellbased on reference SRS transmission (in the SRS transmission occasion(i) on the activated UL BWP (b) of carrier (f) on the serving cell (c)),the Type 3 power headroom (i.e., PH_(type3b,f,c)(i, q_(s))) may bedetermined by Eq. 8.

PH_(type3,b,f,c)(i,q _(s))={tilde over (P)} _(CMAX,f,c)(i)−{P_(O_SRS,b,f,c)(q _(s))+α_(SRS,b,f,c)(q _(s))·PL _(b,f,c)(q _(d))+h_(b,f,c)(i)}[dB]  [Eq. 8]

Power Headroom Reporting Related Procedure

The BS uses PHR-Config to configure the UE to perform power headroomreporting, which is described in the TS 38.331 as shown in Table 13below.

TABLE 13 PHF-Config The IE PHR-Config is used to configure parameters for power headroom reporting.   PHR-Config information element  -- ASN1START  -- TAG-PHR-CONFIG-START PHR-Config ::= SEQUENCE {   phr-PeriodicTimer ENUMERATED {sf10, sf20, sf50,  sf100, sf200,sf500, sf1000, infinity},  phr-ProhibitTimer    ENUMERATED {sf0, sf10, sf20, sf50, sf100,sf200, sf500, sf1000},   phr Tx PowerFactorChange    ENUMERATED {dB1, dB3, dB6, infinity},   multiplePHR  BOOLEAN,  dummy   BOOLEAN,   phr-Type2OtherCell   BOOLEAX,   phr-ModeOtherCG   ENUMERATED {real, virtual},   ...  }  -- TAG-PHR-CONFIG-STOP -- ASN1STOP

Each field in Table 13 may be defined as follows.

‘dummy’: This field is not used in this version of the specification andthe UE ignores the received value.

‘multiplePHR’: Indicates if power headroom shall be reported using theSingle Entry PHR MAC control element or Multiple Entry PHR MAC controlelement defined in TS 38.321 [3]. True means to use Multiple Entry PHRMAC control element and False means to use the Single Entry PHR MACcontrol element defined in TS 38.321 [3]. The network configures thisfield to true for MR-DC and UL CA for NR, and to false in all othercases.

‘phr-ModeOtherCG’: Indicates the mode (i.e. real or virtual) used forthe PHR of the activated cells that are part of the other Cell Group(i.e. MCG or SCG), when DC is configured. If the UE is configured withonly one cell group (no DC), it ignores the field.

‘phr-PeriodicTimer’: Value in number of subframes for PHR reporting asspecified in TS 38.321 [3]. Value sf10 corresponds to 10 subframes,value sf20 corresponds to 20 subframes, and so on.

‘phr-ProhibitTimer’: Value in number of subframes for PHR reporting asspecified in TS 38.321 [3]. Value sf0 corresponds to 0 subframe, valuesf10 corresponds to 10 subframes, value sf20 corresponds to 20subframes, and so on.

‘phr-Tx-PowerFactorChange’: Value in dB for PHR reporting as specifiedin TS 38.321 [3]. Value dB1 corresponds to 1 dB, dB3 corresponds to 3 dBand so on. The same value applies for each serving cell (although theassociated functionality is performed independently for each cell).

‘phr-Type2OtherCell’: If set to true, the UE shall report a PHR type 2for the SpCell of the other MAC entity. See TS 38.321 [3], clause 5.4.6.Network sets this field to false if the UE is not configured with anE-UTRA MAC entity.

A power headroom report (PHR) may be triggered if a specific eventoccurs as described in Table 14 below.

TABLE 14 A Power Headroom Report (PHR) shall be triggered if any of thefollowing events occur: phr-ProhibitTimer expires or has expired and thepath loss has changed more than phr-Tx- PowerFactorChange dB for atleast one activated Servicing Cell of any MAC entity which is used as apathloss reference since the last transmission of a PHR in this MACentity when the MAC entity has UL resources for new transmission: NOTE1: The path loss variation for one cell assessed above is between thepathloss measured at present time on the current pathloss reference andthe pathloss measured at the transmission time of the last transmissionof PHR on the pathloss reference in use at that time, irrespective ofwhether the pathloss reference has changed in between. phr-PeriodicTimerexpires; upon configuration or reconfiguration of the power headroomreporting functionality by upper layers, which is not used to disablethe function; activation of an SCell of any MAC entity with configureduplink; addition of the PSCell (i.e. PSCell is newly added or changed);phr-ProhibitTimer expires or has expired, when the MAC entity has ULresources for new transmission, and the following is true for any of theactivated Serving Cells of any MAC entity with configured uplink: thereare UL resources allocated for transmission or there is a PUCCHtransmission on this cell, and the required power backoff due to powermanagement (as allowed by P-MPR_(c) as specified in TS 38.101-1 [14] TS38.101-2 [15], and TS 38.101-3 [16]) for this cell has changed more thanphr-Tx- PowerFactorChange dB since the last transmission of a PHR whenthe MAC entity had UL resources allocated for transmission or PUCCHtransmission on this cell. NOTE 2: The MAC entity should avoidtriggering a PHR when the required power backoff due to power managementdecreases only temporarily (e.g. for up to a few tens of millisecond)and it should avoid reflecting such temporary decrease in the values ofP_(CMAX, f, c)/PH when a PHR is triggered by other triggeringconditions.

Suppose an uplink transmission resource for new transmission isallocated to the MAC entity of the UE, as described in Table P6. In thatcase, the UE may transmit the power headroom and/or PCMAX correspondingto the Type 1 PHR, Type 2 PHR, and/or Type 3 PHR to the BS by includingthe power headroom and/or the PCMAX in the MAC-CE. Detailed conditionsand steps related to the transmission are shown in Table 15.

TABLE 15 if the MAC entity has UL resources allocated for a newtransmission the MAC entity shall: 1> if it is the first UL resourceallocated for a new transmission since the last MAC reset: 2> startphr-PeriodicTimer; 1> if the Power Headroom reporting proceduredetermines that at least one PHR has been triggered and not cancelled;and 1> the allocated UL resources can accomodate the MAC CE for PHRwhich the MAC entity is configured to transmit plus its subheader, as aresult of LCP as defined in subclause 5.4.3.1: 2> if multiplePHR withvalue true is configured: 3> for each activated Serving Cell withconfigured uplink associated with any MAC entity: 4> obtain the value ofthe Type 1 or Type 3 power headroom for the corresponding uplink carrieras specified in subclause 7.7 of TS 38.213 [6]; 4> if this MAC entityhas UL resources allocated for transmission on this Serving Cell; or 4>if the other MAC entity, if configured, has UL resources allocated fortransmission on this Serving Cell and phr-ModeOtherCG is set to real byupper layers: 5> obtain the value for the corresponding PCMAX, f, cfield from the physical layer. 3> if phr-Type2OtherCell with value trueis configured: 4> if the other MAC entity is E-UTRA MAC entity: 5>obtain the value of the Type 2 power headroom for the SpCell of theother MAC entity (i.e. E-UTRA MAC entity): 5> if phr-ModeOtherCG is setto real by upper layers: 6> obtain the value for the correspondingPCMAX, f, c field for the SpCell of the other MAC entity (i.e. E-UTRAMAC entity) from the physical layer. 3> instruct the Multiplexing andAssembly procedure to generate and transmit the Multiple Entry PHR MACCE as defined in subclause 6.1.3.9 based on the values reported by thephysical layer. 2> else (i.e. Single Entry PHR format is used): 3>obtain the value of the Type 1 power headroom from the physical layerfor the corresponding uplink carrier of the PCell; 3> obtain the valuefor the corresponding PCMAX, f, c field from the physical layer; 3>instruct the Multiplexing and Assembly procedure to generate andtransmit the Single Entry PHR MAC CE as defined in subclause 6.1.3.8based on the values reported by the physical layer. 2> start or restartphr-PeriodicTimer; 2> start or restart phr-ProhibitTimer; 2> cancel alltriggered PHR(s).

As described above, the UE may transmit the value(s) for the Type 1/2/3power headroom report (for example, power headroom(s) and/or PCMAX(s))to the MAC layer from the Physical layer of the UE using the informationpreconfigured by the BS, and the MAC layer may deliver/report thevalue(s) (for example, power headroom(s) and/or PCMAX(s)) received(i.e., delivered) from the Physical layer as described in Tables 14 and15 to the BS through the MAC-CE (for example, single Entry PHR MAC CE orMultiple Entry PHR MAC CE). For example, the MAC CE for thecorresponding power headroom report may be delivered/reported to the BSthrough the S920 step of FIG. 9 or transmitted/reported to the BSthrough uplink transmission performed subsequently.

Also, when the PHR-related value(s) described in the present disclosure(for example, all PHR-related values including variations of thecorresponding values in addition to PH and/or virtual PH and/or PCMAX)is transmitted/delivered/reported (through MAC CE), the correspondingvalues may be interpreted as being transmitted/delivered/reported in Nbit levels (i.e., N=6).

The above contents (e.g., 3GPP system, CSI-related operation, etc.) maybe applied in combination with the methods proposed in the presentdisclosure, or may be supplemented to clarify technical characteristicsof the methods proposed in the present disclosure. In addition, in thepresent disclosure, may mean including (and) all of the contentseparated by/or include only a part of the separated content (or). Inaddition, in the present disclosure, the following terms are useduniformly for convenience of explanation

<Type II CSI Codebook-Based CSI Reporting Related Content>

In the above-described wireless communication environment, for accurateand efficient channel state information (channel state information, CSI,hereinafter CSI) feedback in terms of feedback overhead, high-resolutionfeedback methods such as linear combination (LC) and covariance matrixfeedback are being considered. In particular, in the NR (New RAT)system, Type II CSI feedback considers the ‘DFT-based compression’method described in Table 16 as a method of combining beams (e.g.,combining beams based on amplitude and/or phase) in a subband (SB)-widewidth with respect to W₁ composed of L orthogonal DFT beamscorresponding to wideband (WB) information.

Table 16 shows an example of a DFT-based compression scheme from theviewpoint of reducing CSI reporting overhead based on the Type II CSIcodebook of rank 1-2.

TABLE 16 DIT-based compression Precoders for a layer is given by size-P× N₃ matrix W = W₁{tilde over (W)}₂W_(f) ^(H)  P = 2N₁N₂ = #SDdimensions  N₃ = #FD dimensions   FFS value and unit of N₃  Precodernormalization: the precoding matrix for given rank and unit of N₃ isnormalized to  norm 1/sqrt(rank) Spatial domain (SD) compression  Lspatial domain basis vectors (mapped to the two polarizations, so 2L intotal) selected  ${{{Compression}{in}{spacial}{domain}{using}W_{1}} = \begin{bmatrix}{v_{0}v_{1}\ldots v_{L - 1}} & 0 \\0 & {v_{0}v_{1}\ldots v_{L - 1}}\end{bmatrix}},{{where}\left\{ v_{i} \right\}_{i = 0}^{L - 1}}$  areN₁N₂ × 1 orthogonal DFT vectors (same as Rel. 15 Type II)Frequency-domain (FD) compression  CompressionviaW_(f) = [W_(f)(0), …, W_(f)(2L − 1)]whereW_(f)(i) = [f_(k_(i, 0))f_(k_(i, 1))…f_(k_(i, M_(i) − 1))], where {f_(k) _(i,m) }_(m=0) ^(M) ^(i) ⁻¹ are M_(i) size-N₃ × 1orthogonal DFT vectors for SD-component  i = 0, . . . , 2L − 1   Numberof FD-components {M_(i)} or Σ_(i=0) ^(2L−1) M_(i) is configurable. FFSvalue range  FFS: choose one of the following alternatives   Alt1.common basis vectors; W_(f) = [f_(k) ₀ f_(k) ₁ . . . f_(k) _(M−1) ],i.e. M_(i) = M ∀i and   {k_(i,m)}_(m=0) ^(M) ^(i) ⁻¹ are identical(i.e., k_(l,m) = k_(m), i = 0, . . . , 2L − 1)   Alt2. independent basisvectors: W_(f) = [W_(f)(0), . . . , W_(f)(2L − 1)],where W_(f)(i) =   [f_(k_(i, 0))f_(k_(i, 1))…f_(k_(i, M_(i) − 1))], i.e.M_(i)frequency − domaincomponents(perSD − component)  are selected   Note: {k_(m) _(:) }_(m=0) ^(M−1) or {k_(i,m)}_(m=0)^(M) ^(i) ⁻¹, i = 0, . . . , 2L − 1 are all selected from the index set  {0, 1, . . . , N₃ − 1} from the same orthogonal basis group  FFS: Ifoversampled DFT basis or DCT basis is used instead of orthogonal DFTbasis  FFS: Same or different FD-basis selection across layers Linearcombination coefficients (for a layer)  FFS if {tilde over (W)}₂ iscomposed of K = 2LM or K = Σ_(i=0) ^(2L−1) M_(i) linear combinationcoefficients  FFS if only a subset K₀ < K of coefficients are reported(coefficients not reported are zero).  FFS if layer compression isapplied so that Σ_(i=0) ^(2L−l−1) M_(i) transformed coefficients areused to  construct {tilde over (W)}₂ for layer 1 (where the transformedcoefficients are the reported quantity)  FFSquantization/encoding/reporting structure  Note: The terminology“SD-compression” and “FD-compression” are for discussion  purposes onlyand are not intended to be captured in the specification

In addition, a method of extending the DFT-based compression method tothe case of RI=3-4 is also being considered. A method of determining thenumber of non-zero (NZ) coefficients for each layer may be selected fromthe following examples (Alt 0/Alt1), in conjunction with the agreementthat the maximum number of total non-zero (NZ) coefficients across alllayers can be less than or equal to 2K₀ (where K₀ value (i.e., beta β)is set for RIϵ{1,2}).

Alt0. K_(NZ,i) is unrestricted as long as Σ_(i=0) ^(RI-1)K_(NZ,i)≤2K₀

Alt1. K_(NZ,i)≤K0 is unrestricted as long as Σ_(i=0) ^(RI-1)K_(NZ,i)≤2K₀

When the parameter P=v₀ for RI=3-4 is set as a higher layer inconjunction with the parameter p=v₀ for RI=1-2, Table 17 below may besupported.

The parameter (y₀, v₀) may be selected from

$\left\{ {\left( {\frac{1}{2},\frac{1}{4}} \right),\left( {\frac{1}{4},\frac{1}{4}} \right),\left( {\frac{1}{4},\frac{1}{8}} \right)} \right\}.$

TABLE 17 RI Layer L p 1 0 X₀ y₀ 2 0 1 3 0 v₀ 1 2 4 0 1 2 3

The above description refers to expressing channel information by usinga basis such as DFT or a codebook for spatial domain (SD) and frequencydomain (FD) information of CSI. The size of the reported total feedbackis affected by the number of beams to be combined, the amount ofquantization for combining coefficients, the size of a subband, etc.,and in CSI feedback, most of the payload is generated when the UEreports information of {tilde over (W)}₂ to the base station. Here,{tilde over (W)}₂ is composed of linear combination coefficients for theSD/FD codebook in the DFT-based compression scheme, and may berepresented by a matrix of a size of 2L×M.

In particular, when the rank exceeds 1, it is necessary to separatelydesignate the SD/FD compression codebook for each layer, or even if thesame codebook is applied to all layers, since channel information isconfigured in the overlapping sum {tilde over (W)}₂ of SD and FD foreach layer of the codebook, as the rank increases, the channel stateinformation that needs to be fed back also increases linearly.

In NR, conventionally, in the case of the CSI feedback of the singlebase station and the UE, such as the CSI reporting using the PUSCH, theCSI component (or parameter) is divided into part 1 and part 2 so thatit can be transmitted based on the feedback resource capacity allocatedto the UCI, and by omitting channel state information according to apriority level within each part, it was possible to satisfy therequirement for the amount of UE CSI feedback resources.

However, unlike the conventional method of reporting the linearcombining (LC) coefficients for the spatial domain beam for each subband(SB), the enhanced Type II CSI codebook newly considered in NR is usedin the frequency domain for the corresponding subbands. Therefore, sinceit is impossible to directly reuse the existing CSI omission operation,the CSI omission method needs to be newly considered according to theCSI codebook design.

<UCI Parameter Related Content>

UCI constituting the Type II CSI reporting may include parameters asshown in Table 18.

Table 18 shows examples of parameters constituting UCI part 1 and part2. UCI part 1 may mean part 1 CSI, and UCI part 2 may mean part 2 CSI.

TABLE 18 Parameter Location Details/description RI UCI part 1 RIϵ{l, . .. , RI_(MAX)} # NZ coefficients UCI part 1 # NZC summed across layers,K_(NZ, TOT) ϵ{l, 2, . . . , 2K₀} Wideband CQI UCI part 1 Same as R15Subband CQI UCI part 1 Same as R15 Bitmap per layer UCI part 2 RI = 1-2:for layer 1, size-2LM RI = 3-4: for layer 1, size-2LM_(i) − 1 Strongestcoefficient UCI part 2 indicator (SCI) SD basis subset UCI part 2Layer-common with selection indicator combinatorial indicator FD basissubset UCI part 2 selection indicator LC coefficients: UCI part 2Quantized independently across phase layers LC coefficients: UCI part 2Quantized independently across amplitude layers (including referenceamplitude for weaker polarization, for each layer) SD oversampling UCIpart 2 Values of q₁, q₂ follow Rel. 15 (rotation) factor q₁, q₂

Each parameter constituting UCI will be described

RI (ϵ{1, . . . , RI_(MAX)}) and K_(NZ TOT) (the total number of non-zerocoefficients summed across all the layers, where K_(NZ TOT) ϵ{1, 2, . .. , 2K₀}) is reported in UCI part 1.

In RI=3-4, the bitmaps, each of which size is 2LM_(i) (i=0, 1, . . . ,RI−1, where i represents the i-th layer), are reported in UCI part 2.

The following FD basis subset selection schemes are supported:

-   -   In N₃≤19, one-step free selection is used.    -   In N₃>19, the window-based IntS and fully parameterized        M_(initial) indicate an intermediate set composed of FD bases        mod(M_(initial)+n, N₃), n=0, 1, . . . , N₃′−1. N₃′=┌αM ┐, where        α is set as a higher layer from two possible values.    -   The second step subset selection is indicated by a X₂ bit        combinatorial indicator (for each layer) in the UCI part 2.

In SCI for RI=1, the strongest coefficient indicator (SCI) is the ┌log₂K_(NZ)┐-bit indicator.

In SCI of RI>1 (reported within UCI part 2), SCI_(i) by layer, i.e., is┌log₂ K_(NZ)┐-bit (i=0, 1, . . . , (RI−1)). The positions (indexes) ofthe strongest LC coefficients of layer i before index remapping are(l_(i)*,m_(i)*), SCI_(i)=l_(i)*, and m_(i)* is not reported.

For SCI (RI>1) and FD basis subset selection indicators, the schemesdescribed in Table 94 below are supported

TABLE 19 SCI for RI > 1 Alt3.4: Per-layer SCI, where SCI_(i) is a ┌log₂2L┐ -bit (i = 0, 1, . . . (RI − 1)). The location (index) of thestrongest LC coefficient for layer i before index remapping is (l_(i)^(*), m_(i) ^(*)), SCI_(i) = l_(i) ^(*), and m_(i) ^(*) is not reportedIndex remapping For layer i, the index m_(i) of each nonzero LCcoefficient c_(l) _(i) _(,m) _(i) is remapped with respect to m_(i) ^(*)to {tilde over (m)}_(i) such that {tilde over (m)}_(i) ^(*) = 0. The FDbasis index k_(m) _(i) associated to${each}{nonzero}{LC}{coefficient}c_{l,m_{i}}{is}{remapped}{with}{respect}{to}k_{m_{\overset{*}{i}}}{to}{\overset{\sim}{k}}_{m_{i}}$${{such}{that}{\overset{\sim}{k}}_{m_{\overset{*}{i}}}} = {0.{The}{sets}\left\{ {c_{l_{i},{\overset{\sim}{m}}_{i}} \neq c_{l_{\overset{*}{i}},0}} \right\}{and}\left\{ {{\overset{\sim}{k}}_{m_{i}} \neq 0} \right\}{are}{{reported}.}}$Informative note (for the purpose of reference procedure): The index(l_(i), m_(i)) of nonzero LC coefficients is remapped as (l_(i), m_(i))→ (l_(i), (m_(i) − m_(i) ^(*))mod M_(i)). The codebook index associatedwith nonzero LC coefficient index (l_(i), m_(i)) is remapped as$\left. k_{m_{i}}\rightarrow{\left( {k_{m_{t}} - k_{m_{\overset{*}{i}}}} \right){mod}{N_{3}.}} \right.$Combinatorial indicator for N₃ ≤ 19$\left\lceil {\log_{2}\begin{pmatrix}{N_{3} - 1} \\{M_{i} - 1}\end{pmatrix}} \right\rceil{bits}$ Combinatorial indicator for N₃ > 19$\left\lceil {\log_{2}\begin{pmatrix}{N_{3}^{\prime} - 1} \\{M_{i} - 1}\end{pmatrix}} \right\rceil - {bit}$ M_(initial) Reported in UCI part 2,details on bitwidth and possible values are FFS

<CSI Omission Related Content>

When the uplink resources allocated for the UCI are not sufficient forthe full CSI reporting, the CSI omission may occur. The CSI omission maybe expressed as UCI omission. When the CSI omission (omission) occurs,the selected UCI omission scheme needs to satisfy the followingcriteria. i) CSI calculation is identical to the case without omission(identical). Otherwise, the UE will eventually recalculate the CSI whenUCI omission occurs. When the UCI omission occurs, the related CQI maynot be conditionally calculated in PMI after the omission. ii) Theoccurrence of the UCI omission may be inferred from related CSIreporting without additional signaling. iii) The resulting UCI payloadafter the omission need not be ambiguous (because of payload ambiguity,the base station needs to perform blind decoding of UCI part 2). iv)When CSI omission occurs, dropping all NZCs associated with/related toany particular layer should not be done.

A non-zero LC coefficient (NZC) associated with/related to the layerλϵ{0, 1, . . . , RI−1}, beam lϵ{0, 1, . . . , 2L−1}, and FD basis mϵ{0,1, . . . , M−1} may be represented by c_(l,m) ^((λ)).

For the purpose of UCI omission, parameters of UCI part 2 may be dividedinto 3 groups, and group (n) has a higher priority than group (n+1)(n=0, 1).

When the UE is configured to report the N_(Rep) CSI reporting, group 0includes at least SD rotation factors, SD indicator, and SCI(s) for allN_(Rep) reports. For each of the N_(Rep) reports, group 1 may include atleast a reference amplitude(s) for weaker polarization, {c_(l,m) ^((λ)),(λ,l,m)ϵG_(l)}, and an FD indicator. For each of the reports, group 2includes at least {c_(l,m) ^((λ)), (λ,l,m)ϵG₂}. Where G1 and G2 excludeindices related to the strongest coefficient(s).

A priority rule for determining G1 and G2 may be selected from thefollowing Alt1.1 to Alt 1.3:

Alt 1.1: LC coefficients may be prioritized from high priority to lowpriority according to (λ,l,m). (index triplet, ┌K_(M2) ^(TOT)/2┐ highestpriority coefficients belong to G1, and lowest priority coefficientsbelong to G2. A priority level may be calculated according toPrio(λ,l,m)=2L·RI·Perm₁(m)+RI·Perm₂(l)+λ.

Alt 1.2: non-zero coefficients c_(l,m) ^((λ)) are based on λ->|->mindexing (layer->SD->FD), or C coefficients are sorted sequentially from0 to KNZ−1 in the order based on I->λ->m indexing (SD->layer->FD). GroupG1 includes at least first

$\frac{K_{NZ}}{2}$

sorted coefficients, and group G2 includes the remaining second sortedcoefficients.

Alt 1.3: LC coefficients may be prioritized from high priority to lowpriority according to (λ,l,m) index triplet. (└K_(NZ) ^(TOT)/4┘×2Lhighest priority coefficients belong to G1, and └K_(NZ) ^(TOT)/4L┘×2Llowest priority coefficients belong to G2. A priority level may becalculated according to Prio(λ,l,m)=2L·Perm₁(m)−RI≤Perm2(l)+λ.

Which group(s) β_(l,m) ^((λ)) belongs to is selected from the following(Alt 2.1 to Alt 2.6).

Alt 2.1: (only coupled with Alt 1.1), according to Prio(λ,l,m), thefirst

${{{RI} \cdot 2}{LM}} - \frac{K_{NZ}^{TOT}}{2}$

bits belong to group 1, and according to a Prio(λ,l,m) value, the last

$\frac{K_{NZ}^{TOT}}{2}$

bits belong to group 2.

Alt 2.2: (only coupled with Alt 1.2) Bitmaps and coefficients aresegmented into M segments (M=number of FD basis indices). Group 1contains M1 segments and group 2 contains M2 segments. Here, M=M1+M2.

Each segment includes the bitmap (sub-bitmap) associated with/related toall RI layers, bitmap (sub-bitmap) associated with/related to all the SDcomponents and a single FD component, and corresponding combiningcoefficients. A payload size of group 1 is given as

${{{RI} \cdot 2}{LM}} + {\frac{K_{NZ}^{TOT}}{2}N}$

(N=number of bits for amplitude and phase). A payload size of group 2 isgiven by

$\frac{K_{NZ}^{TOT}}{2}{\left( {a + b} \right).}$

Alt 2.3: (only coupled with Alt 1.3), according to a Prio(λ,l,m) value,the first RI·LM−└K_(NZ) ^(TOT)/4L┘×2L bits belong to group 1, andaccording to the Prio(λ,l,m) value, the last └K_(NZ) ^(TOT)/4L┘×2L bitsbelong to group 2.

Alt 2.4: (only coupled with Alt 1.1), according to the Prio(λ,l,m)value, the first RI·LM bits belong to group 1, and according to thePrio(λ,l,m) value, the last RI·LM belongs to group 2.

Alt2.5: (applicable to any Alt1.x) Bitmaps β_(l,m) ^((λ)) are includedin group 0.

Alt2.6: (applicable to any Alt1.x) Bitmaps β_(l,m) ^((λ)) are includedin group 1.

As described above, the CSI reporting through the PUSCH may be composedof UCI part1 and UCI part2. The UCI part1 includes the number ofamplitude coefficients (K_(NZ)) of RI and non-zero wideband (WB), andthe UCI part2 includes information on PMI of wideband (WB)/subband (SB).A parameter (component) included in the UCI part1 may be a parameter(component) of part1 CSI, and a parameter (component) included in theUCI part2 may be a parameter (component) of part2 CSI. In this case, thepayload of the UCI part1 is fixed, while the payload of the UCI part2has a variable amount (size) according to RI and K_(NZ). Therefore, inorder to determine the payload of the UCI part2, the base station needsto first decode the UCI part1 to calculate RI and K_(NZ) information.Therefore, UCI omission may have to be performed in the UCI part2.Hereinafter, the UCI omission may be replaced/used interchangeably withCSI omission.

In the case where the precoding matrix indicator (PMI) payload for TypeII CSI feedback varies greatly depending on the RI, when reporting CSIusing PUSCH resources, there may be a problem that all the correspondinginformation cannot be included within a limited reporting containersize. In addition, since the RI is set by the UE, in terms of the basestation, there may be limitations in scheduling resource allocation byaccurately predicting the PMI payload for CSI reporting.

For this problem, in the prior art, a method of dropping a plurality ofreporting settings for a plurality of component carriers (CC) of part2CSI according to a predetermined priority rule is used in a CSI omissionprocedure. The base station may calculate the corresponding informationby estimating the remaining omitted subband (SB) PMI in an interpolationmethod based on the received PMI. In order to actually determine thepayload of the UCI part2 transmitted by the UE, the base stationperforms the same CSI omission process as the UE until the UCI code ratereaches a specific level. Therefore, only when a common method for theCSI omission is set/defined between the UE and the base station, theinformation of the UCI part 2 may be properly decoded by the basestation.

As can be seen in ‘Type II CSI codebook-based CSI reporting-relatedcontents’ described above, the enhanced Type II CSI codebook may bedesigned in consideration of frequency domain (FD) compression for aplurality of subband (SB) CSI by utilizing a basis such as DFT. That is,the radio channel information may be expressed by approximatinginformation {tilde over (W)}₂ on a linear combination of the SD basis(W1) and the FD basis (Wf) predetermined or set by the UE and the basestation, and the UE may perform the CSI reporting by transmittingconfiguration information for the codebook and {tilde over (W)}₂. Inthis case, complex-valued LC coefficients as many as 2L×M (e.g., thenumber of SD components (or bases) (2L)×the number of FD components (orbases) (M)) are different from the existing PMI for each SB. That is,since the base station cannot know the distribution according to the SDbasis, the FD basis, and the layer of the corresponding LC coefficientsbefore decoding the UCI part2 information, the above problem cannot besolved through the reuse of the conventional CSI omission rules/methods.

However, when the base station and the UE promise an omission method forLC coefficients and a corresponding bitmap based on the enhanced Type IIcodebook design, the base station sequentially applies the omissionuntil the UCI code rate reaches a specific threshold code rate, andthus, it is possible to estimate the CSI omission level performed by theUE. Therefore, the present disclosure intends to propose a CSI omission(omission) (in UCI part2) method in the enhanced Type II CSI codebook.

In the present disclosure, it is assumed that the Type II CSI codebook(including the enhanced Type II CSI codebook) includes an SDbasis-related matrix, an FD basis-related matrix, and a matrix of LCcoefficients. Also, the matrix of LC coefficients may include amplitudecoefficients and phase coefficients. The codebook may be replaced withterms such as precoder or precoding matrix, and the basis may bereplaced with terms such as a basis vector, a vector, and a component.In addition, for convenience of description, the spatial domain will beexpressed as SD and the frequency domain will be expressed as FD.

For example, the codebook may be denoted by W=W₁{tilde over (W)}₂W_(f)^(H), where W₁ denotes an SD basis-related matrix, {tilde over (W)}₂denotes a matrix of LC coefficients, and W_(f) ^(H) denotes an FDbasis-related matrix. {tilde over (W)}₂ may be expressed as a matrixwith a size of 2L×M. Here, 2L denotes the number of SD bases (here, L isthe number of beam/antenna ports in SD, taking polarization intoconsideration, the total number of SD bases may be 2L), and M denotesthe number of FD bases. Hereinafter, for convenience of description, itwill be described based on the Type II CSI codebook.

<Proposal 1: Implicit CSI Omission Method>

When the UE receives the Type II CSI set as PUSCH-based reporting andthe CSI payload is greater than the allocated resource capacity, for UCIpart 2 (i.e., part 2 CSI) information configuration, it is possible toset/define an omission element and an omission method in a pre-definedmanner.

In the above scheme, when the UE wants to report CSI to the basestation, if the corresponding PUSCH resource capacity does not satisfythe CSI payload, some or all of the UCI part 2 components of the CSI aredropped to allow the UE to transmit the channel information to the basestation within the available resource capacity range. In addition,whether the UE configures UCI by performing the CSI omission may beindicated to the base station.

As described above, the UCI part 2 may include information such as abitmap per layer, an SD/FD basis indicator, LC coefficients per layer(amplitude/phase), and SCI per layer (the strongest coefficientindicator). For example, the information on the LC coefficients mayinclude an indicator indicating amplitude coefficients and an indicatorindicating phase coefficients. Also, the bitmap information for eachlayer may be bitmap information for indicating an indicator indicatingreported amplitude coefficients and an indicator indicating phasecoefficients. In this case, the information on the LC coefficients(amplitude coefficient/phase coefficient) and the bitmap informationcorresponding thereto may have the greatest influence on the payloadsize among the components. Therefore, it is necessary to specify anomission method for these parameters (components) (e.g., amplitudecoefficient, phase coefficient, bitmap, etc.), and the omission methodcan be configured by utilizing SCI for each layer.

Since the SCI information is included in the UCI part 2, the basestation may not know its value before decoding UCI part 2 based on UCIpart 1 information. However, in a situation of RI>1 where the CSIomission may be applied, as described in the ‘UCI parameter-relatedcontents’, as index remapping according to the FD basis and LCcoefficients in the frequency domain for each layer is performed, theSCI needs to exist in a first column (i.e., column index=0) of {tildeover (W)}₂ (matrix of LC coefficients), and may be expressed in themanner of ┌log₂ 2 L┐ only for row index, which may be expressed as inFIG. 8, for example.

FIG. 9 is an example of index remapping of {tilde over (W)}₂ based onSCI. FIG. 9A illustrates the SCI index in {tilde over (W)}₂, and FIG. 9Billustrates the SCI index after the index remapping. FIG. 9 is only anexample for convenience of description, and does not limit the technicalscope of the present disclosure. Referring to FIG. 9, a matrix {tildeover (W)}₂ composed of LC coefficients has a size of {2L×M}. Forexample, in the Type II codebook in which L=4 and M=10 parametersettings are set, the LC matrix {tilde over (W)}₂ may be configured inan 8×10 matrix. As illustrated in FIG. 9A, assuming that the strongestcoefficient is at the position of (5,6), the corresponding index isremapped as illustrated in FIG. 9B and may be set to a value (that is,after remapping, the index of the row of the SCI) corresponding to SCI=5and reported.

Therefore, the LC coefficients corresponding from the FD basis and SDbasis corresponding to SCI may have a greater effect on CSI accuracycompared to other LC coefficients. Based on this, it is possible toconfigure omission priority by differentiating the drop degree ofspecific components in UCI omission.

Here, the important point is that even if the SCI value included in UCIpart 2 is not known, in a state where the base station and the UE agreeon a method for selecting bitmap/LC coefficients based on the SCI, thebase station may also be adjusted to the code rate to which the omissionis applied, so the UCI part 2 may be properly decoded. Therefore, it ispossible for the listed bitmap and LC coefficients to indicate thecorrect value for {tilde over (W)}₂ through the decoded SCI.

Hereinafter, in relation to the UCI omission method of the enhanced TypeII CSI codebook proposed in the present disclosure, a method ofperforming UCI omission based on SCI for each layer will be described indetail.

Proposal 1-1: We propose a method of setting an omission element (e.g.,bitmap, LC coefficients, etc.) and an omission scheme in the frequencydomain for UCI part 2 information configuration of Type II CSI.

1) Method 1

A case in which it is assumed that the number of components (or basis)of the frequency domain FD is M, selects and reports M′ components amongthem, and omits the rest may be considered. For example, in terms offrequency domain (FD), it is used to report LC coefficients belonging tocolumns of {tilde over (W)}₂ set by index=M′−1 (M′<M) consecutive orspecific rules based on the FD basis (index=0) corresponding to the SCI,and the bitmap size may be set as much as the number. That is, thebitmap size may be determined based on the number of reported LCcoefficients. In particular, when selecting the columns of {tilde over(W)}₂ in consideration of the delay profile shape, it may be configuredin such a way that M′/2 pieces are selected starting from index=0, andthe remaining M′/2 pieces are selected in the reverse order fromindex=M−1.

FIG. 10 illustrates an example of setting three levels of omissionpriority in terms of the FD together with a pair of SD bases. In FIG.10, a situation in which the SD beam index is set to ‘SD index=5/pair SDindex=1’ is illustrated as an example. As will be described later, thepriority level for the SD index may also be configurable. FIG. 10 isonly an example for convenience of description, and does not limit thetechnical scope of the present disclosure.

FIG. 10 illustrates an example of a method in which LC coefficientsbelonging to M′ consecutive {tilde over (W)}₂ columns from FD index=0described above are used for reporting and other LC coefficients aredropped, in the situation of the same parameter setting as in FIG. 9. Inthis time, the drop degree uses a specific Equation as an example, butmeans that the priority level to satisfy the resource capacity isexpressed as 0, 1, 2, etc., and is set to report as many LC coefficientsas possible. That is, in order to perform the CSI reporting within theallocated resource capacity, the UCI is configured from a priority levelof 0 so that as many LC coefficients as possible can be reported, butwhen the resource capacity is insufficient, LC coefficients of lowerpriority are omitted may be configured and reported.

2) Method 1-1

As described in the above-described Type II CSI codebook-based CSIreporting-related content, CSI omission-related content, etc., UCIomission for one of the two groups may be performed by dividing linearcombination coefficients (LCCs) to be transmitted and LC coefficients tobe dropped into two groups (e.g., G1 and G2). in a situation in whichUCI omission is performed. UCI omission for one of the two groups may beperformed by dividing it into two groups (e.g., G1 and G2). For example,one group may be dropped/omitted according to the priority of the group.In this case, a priority level for determining which group a specific LCcoefficient belongs to may be expressed as in Equation 9. The prioritylevel may also be expressed as a priority value.

Prio(λ,l,m)=2L·RI·Perm₁(m)+RI·Perm₂(l)+λ  [Equation 9]

Here, λ is a layer index, I is an SD basis index, and m is an FD basisindex. Equation 3 may assume that LC coefficients are prioritized in theorder of i) layer, ii) SD index, and iii) FD index. Also, Perm1( ) andPerm2( ) indicate permutation schemes for FD and SD indices,respectively. The lower/smaller the Prio( ) (i.e., priority level) inEquation 3, the higher the priority of the corresponding LC coefficient.

Specifically, based on the priority given to each LC coefficient, the

$\left\lceil \frac{K_{NZ}^{TOT}}{2} \right\rceil$

LC coefficients with high priority are included in the group with highpriority (e.g., G1) and the remaining

$\left\lfloor \frac{K_{NZ}^{TOT}}{2} \right\rfloor$

LC coefficients are included in the group with low priority (e.g., G2).Here, K_(NZ) ^(TOT) is the total number of non-zero LC coefficients of{tilde over (W)}₂. When performing the omission for CSI, a group havinga lower priority may be omitted first. As an example, G2 including LCcoefficients with low priority may be omitted earlier than G1. In otherwords, LC coefficients with high priority are reported, and LCcoefficients with low priority may be omitted.

Equation 9 and related descriptions may also be referenced/used in anomission operation in a spatial region, which will be described later.

As described above, in the frequency domain (FD) of Proposal 1-1, acolumn corresponding to SCI is located a 0th column through a modulo(modulus) operation. How the SCI information can be reflected in thepriority level (or priority value) Equation may be dealt with. That is,a method of performing CSI omission based on SCI for each layer may beconsidered. The permutation of the FD index may be performed based onthe following methods 1)/2)/3), and the UCI omission may be performed bycalculating a priority level in the frequency domain (FD).

1) Based on the 0th column (that is, based on the column to which SCI isapplicable), the permutation scheme may be configured in ascendingorder. That is, it can be applied to Equation 9 above as Perm1(m)=m. Forexample, the method of permutation in ascending order may be expressedas [0, 1, 2, 3, 4, 5, 6, 7] when M=8. The priority level when m=0 (i.e.,Prio( )) may be the lowest, and the priority level when m=7 may be thehighest. In other words, the priority when m=0 may be the highest, andthe priority when m=7 may be the lowest. LC coefficients in which mcorresponds to 0 to 3 may be included in a high priority group (e.g.,first group G1), and LC coefficients in which m corresponds to 4 to 7may be included in a low priority group (e.g., second group G2).

2) The permutation scheme may be configured in consideration of thedelay profile for the channel in terms of FD.

FIG. 11 illustrates an example of a delay profile of a radio channel.FIG. 11 is only an example for convenience of description, and does notlimit the technical scope of the present disclosure. Referring to FIG.11, the delay profile of the radio channel may be represented by twocases. Specifically, i) a situation in which a subset needs to beconfigured with the basis of increasing index based on the FD basiscorresponding to FD index=0 (FIG. 11(a)), or ii) a situation in which asubset needs to be configured in consideration of both the increasingand decreasing index based on the FD basis corresponding to FD index=0(FIG. 11(b)) may occur representatively.

Therefore, starting with the 0th FD column of {tilde over (W)}₂ which iscomposed of all M FD bases, a configuration method that evenly reflectsthe basis of the left and right (i.e., the index increasing anddecreasing) is needed. That is, the basis index may be alternatelyselected based on the index 0. For example, +1, −1, +2, −2, . . . may beselected by crossing with respect to 0. Alternatively, the selection maybe alternately selected based on 0, such as −1, +1, −2, +2, . . . .Alternatively, the basis index may be selected alternately(intersectingly) with a circular shift.

As a specific example, the FD index [0, 1, 2, 3, 4, 5, 6, 7] in the caseof M=8 may be alternately (intersectingly) selected based on the FDindex=0 according to the above method. For example, the index may beremapped, i.e., permutated, such as [0, 7, 1, 6, 2, 5, 3, 4], so thepriority value may be determined. The LC coefficients corresponding tothe FD index of [0, 7, 1, 6] may be included in the group (e.g., G1)with high priority, and the LC coefficients corresponding to [2, 5, 3,4] may be included in the group (e.g., G2) with low priority.

Alternatively, as an example, the index may be remapped as [0, 1, 7, 2,6, 3, 5, 4], and if it is expressed in a matrix form (Ax=b), may beexpressed as a matrix of the following Equation 10. Here, A denotesPerm1( ), x denotes an FD index, and b denotes a permutation applied FDindex.

$\begin{matrix}{{\begin{bmatrix}1 & 0 & 0 & 0 & 0 & 0 & 0 & 0 \\0 & 1 & 0 & 0 & 0 & 0 & 0 & 0 \\0 & 0 & 0 & 0 & 0 & 0 & 0 & 1 \\0 & 0 & 1 & 0 & 0 & 0 & 0 & 0 \\0 & 0 & 0 & 0 & 0 & 0 & 1 & 0 \\0 & 0 & 0 & 1 & 0 & 0 & 0 & 0 \\0 & 0 & 0 & 0 & 0 & 1 & 0 & 0 \\0 & 0 & 0 & 0 & 1 & 0 & 0 & 0\end{bmatrix}\begin{bmatrix}0 \\1 \\2 \\3 \\4 \\5 \\6 \\7\end{bmatrix}} = \begin{bmatrix}0 \\1 \\7 \\2 \\6 \\3 \\5 \\4\end{bmatrix}} & \left\lbrack {{Equation}10} \right\rbrack\end{matrix}$

That is, based on the permutation (i.e., the remapped index), thepriority level (i.e., Prio( )) when m=0 may be the lowest, and thepriority level when m=4 may be the highest. In other words, the prioritywhen m=0 may be the highest, and the priority when m=4 may be thelowest.

Although the omission method considering the delay profile describedabove is excellent in terms of performance, it may be necessary toinclude a 1-bit indication of the delay profile shape in UCI part 2group 0. In other words, it is necessary to indicate/set which delayprofile the UE follows (e.g., either of FIG. 11A or 11B) using a 1-bitindication.

3) As a method for guaranteeing CSI performance to some extent whileavoiding such an increase in signaling payload, the ascendingpermutation scheme may be configured including −1 or −2 FD basis. Forexample, it may be expressed in the order of [0, 7, 1, 2, 3, 4, 5, 6]according to an ascending permutation scheme including −1st FD basis.For example, it may be expressed in the order of [0, 7, 6, 1, 2, 3, 4,5] according to an ascending permutation scheme including −2nd FD basis.That is, at least one of the −1st or −2nd FD bases may be positionedbetween permutation schemes arranged in ascending order.

As another example, in the permutation configuration, instead ofstarting with the 0th FD basis, the −1 or −2nd FD basis may beconfigured as a starting point. The permutation configuration may beexpressed as Perm1(m)=(m−A)mod M. Here, A may be, for example, a valueset through a higher layer or a fixed value using a value such asA={M−3, M−2, M−1, 0}, and the UE may report information by including theinformation in the UCI part 2. As an example for this, when M=8 andA=M−2, it may be permutated as in [6 7 0 1 2 3 4 5].

In the FD region, based on which permutation scheme of 1)/2)/3)described above, the UCI omission may be performed according to a methodpredefined between the base station and the terminal. Alternatively, thebase station may set a permutation scheme to the UE. Alternatively, theUE may report a permutation scheme applied to UCI omission to the basestation together with CSI reporting.

Based on the above-described permutation scheme, a priority level forthe LC coefficients may be calculated, and the LC coefficients may bedivided into a plurality of groups based on the priorities of the LCcoefficients. The LC coefficients of the lower group may be omittedaccording to the priority of the group. That is, the omission may beperformed according to the priority of the LC coefficient and reportedto the base station.

Proposal 1-2: We propose a method of setting an omission element (e.g.,bitmap, LC coefficients, etc.) and an omission scheme in the spatialdomain for the UCI part 2 information configuration of Type II CSI.

1) Method 1

In a spatial domain (SD) aspect in a manner similar to that of Proposal1-1, it may be set in a manner such as reporting the LC coefficientsbelonging to two rows by utilizing the SD basis corresponding to SCI andthe SD basis being a pair in terms of the antenna port, and the bitmapsize may be set as many as the number. Alternatively, it can be used tooperate by using ±M′ SD bases based on a specific SD basis or to reportLC coefficients belonging to a row of {tilde over (W)}₂ set through aspecific rule.

FIG. 12 illustrates an example of setting omission priority in SD aspectwith a single FD base. FIG. 12 is only an example for convenience ofdescription, and does not limit the technical scope of the presentdisclosure. It is assumed that SCI index=5 in FIG. 12.

Referring to FIG. 12, it may be operated in a method of reporting LCcoefficients included in a beam index (index=1) set in a paired antennaport based on SCI (index=5) and dropping/omission of other values. Inaddition, as the number of rows to be reported (to be used) is reduced,it is possible to set different priority levels. For example, a case ofreporting a pair SD base may be set as priority 0, and a case ofreporting a single SD base may be set as a priority of 1, and thepriority level may be set. When it is impossible to report SD basescorresponding to priority 0 within the allocated resource capacity(i.e., when reporting of pair SD bases is not possible), SD bases (i.e.,single SD bases) corresponding to priority 1 may be reported.

2) Method 1-1

Similar to the methods of Proposal 1-1 described above, a method ofperforming permutation in consideration of SCI in a permutation schemein terms of SD may be considered. It may be said that the influence ofthe SD beam corresponding to the value indicated by the SCI is mostconspicuously reflected in the spatial domain SD of the proposal 1-2.Therefore, a permutation scheme such as 1)/2)/3) below may beconsidered.

1) A method of applying permutation in the spatial region SD regardlessof SCI, that is, the permutation scheme may be configured in ascendingorder based on the 0th row. That is, it can be applied to Equation 9above as Perm₂(l)=l.

2) It is possible to configure a permutation scheme such that the indexis mapped to the 0th row in a row to which the SCI belongs through amodulo operation by reflecting the SCI information. That is, it may beapplied as Perm2(I)=(I-SCI)mod2L. Here, I denotes an SD basis index, andL denotes the number of SD basis vectors. For example, in FIG. 19, whenL=4 and SCI=5, a 6th row (SD index=5) is remapped to the 0th index dueto the Perm2(I) operation, and the same applies to other SD indexes, sothe index may be reset with a circular shift. For example, a row indexmay be reset as in [5, 6, 7, 0, 1, 2, 3, 4]. Therefore, since the casein which the remapped row index is 4 has a low priority, it may beomitted first.

3) A permutation method in which an SD index is preferentially assignedto an SCI and a specific value (SCI_pair) corresponding thereto may beconfigured. Here, SCI_pair indicates an index having oppositepolarization with respect to an SD beam corresponding to SCI. Forexample, in the case of L=4, SCI=5 indicates the second SD beam with[+45 slant angle], and the corresponding SCI_pair is the index havingthe opposite polarization that is the second SD beam with [−45 slantangle], that is, SD index ‘1’. Therefore, it may be determined asSCI_pair=(SCI-L)mod2L fora specific SCI.

Since SCI_pair shares the same SD beam as SCI, it is highly likely thatit includes many LC coefficients that affect CSI accuracy. Therefore, ifthe row corresponding to SCI and the row corresponding to SCI_pair aremapped to the 0th and 1st indexes and given a priority level, it may beeffective in reducing the loss of CSI accuracy while performing the UCIomission. An SD permutation embodiment for this may be expressed asPerm₂=A_(i) using FIG. 12 and the related description. Here,

${A = \begin{bmatrix}{{SCI}\left( {= 5} \right)} \\{{SCI\_ pair}\left( {= 1} \right)} \\x\end{bmatrix}},$

xϵR^(2L-2) Ascending sequence vector (excluding SCI and SCI_pair).

That is, in the above embodiment, it may be expressed as

$x = {\begin{bmatrix}0 \\2 \\3 \\4 \\6 \\7\end{bmatrix}.}$

In the SD region, based on which permutation method of 1)/2)/3)described above, the UCI omission may be performed according to a methodpredefined between the base station and the terminal. Alternatively, thebase station may configure the permutation method to the UE.Alternatively, the UE may report a permutation method applied to UCIomission to the base station together with CSI reporting.

That is, the omission in the FD aspect of Proposal 1-1 and the omissionin the SD aspect of Proposal 1-2 may operate independently or in theform of an intersection, and the configuration according to this will bepossible with higher layer configured or pre-defined.

For example, in Equation 9, the permutation scheme in FD may beperformed by one of the methods described in Proposal 1-1, and thepermutation scheme in SD may be performed by one of the methodsdescribed in Proposal 1-2, and the priority level may be calculated byconsidering both permutations in SD and SD. As a specific example, asthe permutation scheme in FD, a method of alternately selecting a basisindex based on index 0 (e.g., alternate selection based on example 0,such as +1, −1, +2, −2, . . . ) may be applied, and the permutationscheme in SD, a method of selecting an index in ascending order based onthe 0th row may be applied. The UE may perform CSI omission inconsideration of the calculated priority step, and may configure UCI tosatisfy the resource size allocated for CSI reporting and transmit theUCI to the base station.

<Proposal 2: Explicit CSI Omission Method>

When the UE receives Type II CSI for PUSCH-based reporting and the CSIpayload is larger than the allocated resource capacity, the UE mayperform a UCI omission operation, and the UE may consider a method ofsetting the components of UCI part 2 information and the omission methodthrough information (e.g., indicator) related to UCI omission.

In the scheme of Proposal 1, if it was to implicitly estimate the degreeof CSI omission by applying the same set/defined omission method untilthe UCI code rate (code rate) satisfies a specific threshold through theRI of UCI part 1 and the number of non-zero coefficients (NNZC) acrosslayers at the base station side, in proposal 2, a method in which the UEincludes an omission indicator (e.g., UCI omission-related information)in UCI part 1, including the operation of proposal 1, and transmits theomission indicator to the base station may be considered.

Specifically, the presence or absence of UCI omission, which elements ofUCI part 2 became the target of omission if UCI omission has beenperformed, how much omission was performed, etc., may be set through ahigher layer or set/transmitted to the base station according to apredefined rule. Although proposal 2 may increase the payload of UCIpart 1 compared to proposal 1, it has the advantage that the UE and thebase station may promise detailed operations for the CSI omission andaccurately recognize the CSI omission.

For example, the LC coefficients are configured for amplitude and phase,respectively, and one of them may indicate drop/omission. Alternatively,it is possible not only to specify the omission setting method in termsof the FD and/or SD, but also to apply layer-common/layer-group-specificoperation designation of the corresponding operation by promising.Alternatively, configuring the UCI part 2 by adjusting the amplitude ofthe LC coefficients and the quantization degree of the phase may alsohave a great effect in terms of payload reduction.

As an example of a method of setting the components and omission methodof UCI part 2 according to information (e.g., UCI omission indicator)related to UCI omission, Table 20 shows an example of Type II CSIomission operation according to the UCI omission indicator in the caseof layer-common.

TABLE 20 Indicator LC coefficients Omission priority

(2bits) Amp. Phase FD SD Amp. Phase ‘00’ Default Default Default DefaultDefault Default ‘01’ ◯ X 2 1 QPSK — ‘10’ X ◯ 1 1 — 8-PSK ‘11’ ◯ ◯ 0 016-PSK 16-PSK

The UE may transmit/configure information, such as omission state of theLC coefficients (e.g., amplitude coefficient and phase coefficient),omission priority for the frequency domain and spatial domain,quantization degree, to the base station through information (e.g.,indicator) related to UCI omission. The base station may clearlyrecognize the UCI omission operation of the UE based on the informationrelated to the UCI omission.

Through the above-described proposed method and/or embodiments, the UEmay perform the UCI omission within the allocated resource capacity andreport the channel state information to the base station.

FIG. 13 illustrates an example of a signaling flowchart between a userequipment (UE) and a base station to which the method and/or embodimentproposed in the present disclosure can be applied. FIG. 13 is only forconvenience of description, and does not limit the scope of the presentdisclosure. Referring to FIG. 13, it is assumed that the UE and/or thebase station operate based on the methods and/or embodiments of theabove-described proposals 1 and 2. Some of the steps described in FIG.13 may be merged or omitted. In addition, in performing the proceduresdescribed below, the CSI-related operation of FIG. 7 may beconsidered/applied.

The base station may refer to an object that transmits and receives datato and from the UE. For example, the base station may be a conceptincluding one or more transmission points (TPs), one or moretransmission and reception points (TRPs), and the like. In addition, theTP and/or TRP may include a panel of a base station, a transmission andreception unit, and the like. In addition, the TRP may be classifiedaccording to information (e.g., index, ID) on the CORESET group (orCORESET pool). As an example, when one UE is configured to performtransmission/reception with a plurality of TRPs (or cells), this maymean that a plurality of CORESET groups (or CORESET pools) areconfigured for one UE. The setting for such a CORESET group (or CORESETpool) may be performed through higher layer signaling (e.g., RRCsignaling, etc.).

The UE may receive configuration information from the BS S1310. In otherwords, the BS may transmit the configuration information to the UE. Theconfiguration information may be received through higher layer signaling(for example, radio resource control (RRC) or medium accesscontrol-control element (MAC-CE)). For example, the configurationinformation may include (i) CSI related configuration and (ii)configuration related to transmission power control of an uplink channel(for example, PUSCH/PUCCH). For example, the corresponding step may beomitted when the configuration information is preconfigured.

For example, the configuration related to transmission power control ofthe uplink channel (for example, PUSCH/PUCCH) may include configurationrelated to path loss, maximum output power, and target power asdescribed above concerning the uplink power control.

For example, the CSI related configuration may include information onthe period at which a reference signal is transmitted and time domainbehavior information of the reference signal. Also, the CSI relatedconfiguration may include information on a resource and/or a resourceset to which the reference signal is transmitted.

The CSI related configuration may include information on the CSIreporting setting. For example, whether CSI reporting is PUSCH-based CSIreporting or PUCCH-based CSI reporting may be configured based on theCSI related configuration. Also, the CSI related configuration mayinclude resource allocation information for CSI reporting.

For example, the CSI related configuration may include informationrelated to the CSI omission operation of the UE. For example, the CSIrelated configuration may include information used to determine thepriority of CSI (for example, a permutation method).

The UE may receive a reference signal (RS) from the BS S1320. In otherwords, the BS may transmit a reference signal to the UE. For example,the reference signal may be received or transmitted based on theconfiguration information (for example, CSI related configuration). Forexample, the reference signal may be a CSI-RS. The reference signal maybe transmitted periodically, semi-continuously, or aperiodically fromthe BS. Also, the reference signal may be used for CSI measurement andcalculation.

The UE may measure/calculate CSI (S1325). For example, the CSI may bemeasured/calculated based on the (enhanced) Type II CSI codebook, andmay include information on a precoding matrix (e.g., PMI, etc.). Forexample, a precoding matrix based on a linear combination of a basis ina frequency domain and a basis in a spatial domain may be used for CSIcalculation. The row index of the precoding matrix may be related to abasis of a spatial domain, and a column index of the matrix may berelated to a basis of a frequency domain. A column index of thestrongest coefficient indicator (SCI) may correspond to ‘0’.

The CSI includes information for coefficients related to linear couplingcoefficients (e.g., amplitude coefficient, phase coefficient, etc.), forexample, information on amplitude coefficient, information on phasecoefficient, information on the bitmap form related to the coefficients(amplitude coefficient and phase coefficient), information on thestrongest coefficient for each layer, information on the basis of thespatial domain, information on the basis of the frequency domain, andthe like.

The UE may transmit CSI to the BS S1330. In other words, the BS mayreceive CSI from the UE. For example, the CSI may be transmitted throughPUSCH or PUCCH. For example, the transmission power of PUSCH or PUCCHmay be determined based on configuration information. For example, theoperation of determining transmission power may consult or apply theoperation of FIG. 8 and the description related thereto. The CSI reporttransmitted to the BS may consist of a first part and a second part. Forexample, the first part may correspond to the uplink control information(UCI) part 1 (i.e., part 1 CSI), and the second part may correspond tothe UCI part 2 (i.e., part 2 CSI).

A resource for CSI reporting may be allocated based on the configurationinformation, and if the capacity of an allocated resource is smallerthan the UCI payload (i.e., CSI payload to report) size, the CSI reportmay be configured by omitting a portion of the calculated CSI so thatthe CSI reporting may be performed within the available range ofresource capacity. For example, based on the priorities of a pluralityof predefined groups, uplink control information (UCI) configured byomitting a portion of the plurality of groups may be transmitted as aCSI report through PUSCH. For example, some of the componentsconstituting the second part of the CSI report (i.e., UCI part 2) may beomitted. The operation related to the CSI omission may be performedbased on the proposed method (for example, Proposal 1/Proposal 2).

For example, each of the information on the amplitude coefficient, theinformation on the phase coefficient, and the bitmap information relatedto the coefficients may be classified into a plurality of groups basedon a priority value. The priority value and the priority of eachinformation component may be inversely proportional to each other. Thatis, as the priority value is smaller, the priority of the correspondingcomponent may be higher. For example, according to a priority determinedbased on the priority value, a component having a higher priority amongcomponents of information on amplitude coefficients, information onphase coefficients, and bitmap information related to the coefficientsmay be included in the first group, and the group with low priority maybe included in the second group.

In addition, when performing the omission for CSI, based on thepredefined priority of the plurality of groups, a group having a lowerpriority may be omitted first. For example, the first group may have ahigher priority than the second group. Accordingly, the second group maybe omitted earlier than the first group. In other words, the informationon amplitude coefficients, the information on phase coefficients, andthe bitmap information with high priority may be reported, and theomission (omission) may be performed from information with low priority.

The priority value used to classify the information on the amplitudecoefficient, the information on the phase coefficient, and/or thecomponents of the bitmap information related to the coefficients into aplurality of groups may be determined based on at least one of i) layerindex, ii) the index of the spatial area associated with/related to eachcomponent, or iii) the index of the frequency domain associatedwith/related to each component. For example, the priority value may bedetermined based on i) a layer index ii) an index of a spatial domainassociated with/related to each component, and iii) an index of afrequency domain associated with/related to each component.

For example, the priority value may increase in an order in which ahigher index and a lower index of the indexes of the frequency domainassociated with/related to the components are sequentially crossed basedon a predefined specific index. The predefined specific index may beassociated with/related to an index in the frequency domain of astrongest coefficient among the coefficients. For example, thepredefined specific index may be ‘0’. This is because the index isremapped so that the index of the strongest coefficient in the frequencydomain is located in the first column (i.e., column index=0).

As another example, the priority value may increase in an ascendingorder of the index of the spatial region. As another example, i) theindex of the spatial region of the strongest coefficient and ii) theindex of the spatial region corresponding to the beam having theopposite polarization with respect to the beam corresponding to thestrongest coefficient may have the highest priority (i.e., the priorityvalue may be the smallest). After that, the priority values of theremaining indexes may be sequentially determined in ascending order.Alternatively, the indexes are remapped so that the index of the spatialregion of the strongest coefficient becomes 0, and the remaining indexesare also remapped in the form of a cyclic shift, and then priorityvalues may be determined in the order of the remapped indexes.

As another example, when some of the bases (or components) (e.g., M) ofthe frequency domain are reported (e.g., M′) and the remaining parts areomission, it is possible to select the consecutive indexes as many asthe bases to be reported based on based on the index (e.g., index=0) inthe frequency domain of the strongest coefficient, and report theinformation on the corresponding coefficients and the information in theform of a bitmap corresponding to the coefficients. As a similarexample, when reporting some of the basis (or components) of the spatialdomain, the index corresponding to the index in the spatial domain ofthe strongest coefficient and the coefficients corresponding to theindexes of the SD bases that is a pair in terms of the antenna port andthe information in the form of the bitmap corresponding to thecoefficients may be reported (coefficients corresponding to theremaining SD base indexes and the information in the form of the bitmapcorresponding thereto may be omitted).

For example, the CSI reporting may further include informationindicating a delay profile applied by the UE or information used by theUE to determine a priority for CSI omission (e.g., a permutationscheme).

As described in the above-described proposal 2, the CSI reporting (orUCI) may further include information related to the CSI omissionoperation. In other words, the UE may explicitly transmit informationrelated to the CSI omission operation to the base station. For example,since the CSI reporting may be configured by omission of a specificgroup according to the priority of a plurality of groups, it may includeinformation related to the omission of a specific group to be omitted.For example, the information related to the CSI omission operation maybe transmitted while being included in the first part of the CSIreporting.

For example, the information related to the CSI omission operation mayinclude information on at least one of i) presence and absence ofomission operation (i.e., whether the UE has performed omission), ii)omission target, or iii) omission. The UE may transmit/configureinformation, such as omission state of the coefficients, omissionpriority for the frequency domain and spatial domain, quantizationdegree, to the base station through information (e.g., indicator)related to the CI omission. The base station may clearly recognize theCSI omission operation of the UE based on the information related to theCSI omission.

FIG. 14 illustrates an example of an operation flowchart of a UE towhich the method and/or embodiment proposed in the present disclosuremay be applied. FIG. 14 is only for convenience of description, and doesnot limit the scope of the present disclosure. Referring to FIG. 14, itis assumed that the UE and/or the base station operate based on themethods and/or embodiments of the above-described proposals 1 and 2.Some of the steps described in FIG. 14 may be merged or omitted. Inaddition, in performing the procedures described below, the CSI-relatedoperation of FIG. 7 may be considered/applied.

The UE may receive configuration information from the BS S1410. Theconfiguration information may be received through higher layer signaling(for example, radio resource control (RRC) or medium accesscontrol-control element (MAC-CE)). For example, the configurationinformation may include (i) CSI related configuration and (ii)configuration related to transmission power control of an uplink channel(for example, PUSCH/PUCCH).

For example, the configuration related to transmission power control ofthe uplink channel (for example, PUSCH/PUCCH) may include configurationrelated to path loss, maximum output power, and target power asdescribed above concerning the uplink power control.

For example, the CSI related configuration may include information onthe period at which a reference signal is transmitted and time domainbehavior information of the reference signal. Also, the CSI relatedconfiguration may include information on a resource and/or a resourceset to which the reference signal is transmitted. The CSI relatedconfiguration may include information on the CSI reporting setting. Forexample, whether CSI reporting is PUSCH-based CSI reporting orPUCCH-based CSI reporting may be configured based on the CSI relatedconfiguration. Also, the CSI related configuration may include resourceallocation information for CSI reporting.

For example, the CSI related configuration may include informationrelated to the CSI omission operation of the UE. For example, the CSIrelated configuration may include information used to determine thepriority of CSI (for example, a permutation method).

For example, the operation of receiving configuration information by theUE (100/200 of FIGS. 16 to 20) in the S1410 step from the BS (100/200 ofFIGS. 16 to 20) may be implemented by the devices of FIGS. 16 to 20 tobe described later. For example, referring to FIG. 17, one or moreprocessors 202 may control one or more transceivers 206 and/or one ormore memories 204 to receive the configuration information. And one ormore transceivers 206 may receive the configuration information from theBS.

The UE may receive a CSI-Reference Signal (CSI-RS) from the BS S1420. Inother words, the CSI-RS may be received based on the CSI relatedconfiguration. For example, the CSI-RS may be transmitted periodically,semi-continuously, or aperiodically from the BS. Also, the CSI-RS may beused for CSI measurement and calculation.

For example, the operation of receiving a CSI-RS by the UE (100/200 ofFIGS. 16 to 20) in the S1420 step from the BS (100/200 of FIGS. 16 to20) may be implemented by the devices of FIGS. 16 to 20 to be describedlater. For example, referring to FIG. 17, one or more processors 202 maycontrol one or more transceivers 206 and/or one or more memories 204 toreceive the CSI-RS. And one or more transceivers 206 may receive theCSI-RS from the BS.

The UE may measure/calculate CSI (S1430). For example, the CSI may bemeasured/calculated based on the (enhanced) Type II CSI codebook, andmay include information on a precoding matrix (e.g., PMI, etc.).

For example, the CSI may include information related with coefficients.The information related to the coefficients may include at least one ofi) information on the amplitude coefficient, ii) information on thephase coefficient, or iii) bitmap information related to the amplitudecoefficient and the phase coefficient.

For example, the operation of measuring/calculating the CSI by the UE(100/200 in FIGS. 16 to 20) in step S1430 described above may beimplemented by the device in FIGS. 16 to 20 to be described below. Forexample, referring to FIG. 17, one or more processors 202 may controlone or more transceivers 206 and/or one or more memories 204 tomeasure/calculate the CSI.

The UE may transmit, to the BS, a CSI report configured by omitting aportion of the plurality of groups based on a pre-defined priority ofthe plurality of groups, through the Physical Uplink Shared Channel(PUSCH) S1340. The transmission power of the PUSCH is determined basedon the configuration information. The CSI report may include a firstpart and a second part. For example, the first part may correspond tothe uplink control information (UCI) part 1 (i.e., part 1 CSI), and thesecond part may correspond to the UCI part 2 (i.e., part 2 CSI).

A portion of the second part of the CSI report may be omitted. Omissionof the second part of the CSI report may be performed based on theproposed methods (for example, Proposal 1/Proposal 2). For example, theconstituting elements of the information related to the coefficients(for example, information on the amplitude coefficient, information onthe phase coefficient, and bitmap information related to the amplitudecoefficient and the phase coefficient) may be classified into aplurality of groups based on their priority values, and the CSI report,namely, UCI may be configured by omitting a specific group according tothe priority of the plurality of groups. A group with a low priority maybe omitted first. For example, a specific group to be included in thesecond part of the CSI report may be omitted.

For example, as the priority value is smaller, the priority of eachcomponent may be higher. For example, according to the prioritydetermined based on the priority value, an element with high priorityamong elements of the information related to the coefficients may beincluded in the first group, and an element with low priority may beincluded in the second group. The priority of the first group is higherthan that of the second group, and thus, the second group may be omittedbefore the first group.

The priority value may be determined based on at least one of i) a layerindex ii) an index of a spatial domain associated with/related to eachcomponent or iii) an index of a frequency domain associated with/relatedto each component. For example, the priority value may be determinedbased on i) a layer index ii) an index of a spatial domain associatedwith/related to each component, and iii) an index of a frequency domainassociated with/related to each component.

For example, the priority value may increase in an order in which ahigher index and a lower index of the indexes of the frequency domainassociated with/related to the components are sequentially crossed basedon a predefined specific index. The predefined specific index may beassociated with/related to an index in the frequency domain of astrongest coefficient among the coefficients. For example, thepredefined specific index may be ‘0’.

As another example, the priority value may increase in an ascendingorder of the index of the spatial region. As another example, i) theindex of the spatial region of the strongest coefficient and ii) theindex of the spatial region corresponding to the beam having theopposite polarization with respect to the beam corresponding to thestrongest coefficient may have the highest priority (i.e., the priorityvalue may be the smallest). After that, the priority values of theremaining indexes may be sequentially determined in ascending order.Alternatively, the indexes are remapped so that the index of the spatialregion of the strongest coefficient becomes 0, and the remaining indexesare also remapped in the form of a cyclic shift, and then priorityvalues may be determined in the order of the remapped indexes.

As another example, when some of the bases (or components) (e.g., M) ofthe frequency domain are reported (e.g., M′) and the remaining parts areomission, it is possible to select the consecutive indexes as many asthe bases to be reported based on based on the index (e.g., index=0) inthe frequency domain of the strongest coefficient, and report theinformation on the corresponding coefficients and the information in theform of a bitmap corresponding to the coefficients. As a similarexample, when reporting some of the basis (or components) of the spatialdomain, the index corresponding to the index in the spatial domain ofthe strongest coefficient and the coefficients corresponding to theindexes of the SD bases that is a pair in terms of the antenna port andthe information in the form of the bitmap corresponding to thecoefficients may be reported (coefficients corresponding to theremaining SD base indexes and the information in the form of the bitmapcorresponding thereto may be omitted).

The CSI reporting may further include information related to the CSIomission. For example, since the CSI reporting (or UCI) may beconfigured by omission of a specific group according to the priority ofa plurality of groups, it may include information related to theomission of a specific group to be omitted. For example, the informationrelated to the omission of the specific group may include information onat least one of i) presence and absence of omission (i.e., whether theUE has performed omission), ii) omission target, or iii) omissiondegree. For example, the information (i.e., information related toomission of a specific group) related to the CSI omission may betransmitted while being included in the first part of the CSI reporting.

For example, the operation of transmitting UCI by the UE (100/200 ofFIGS. 16 to 20) in the S1440 step to the BS (100/200 of FIGS. 16 to 20)through PUSCH may be implemented by the devices of FIGS. 16 to 20 to bedescribed later. For example, referring to FIG. 17, one or moreprocessors 202 may control one or more transceivers 206 and/or one ormore memories 204 to transmit UCI through PUSCH. And one or moretransceivers 206 may transmit UCI to the BS through PUSCH.

FIG. 15 illustrates an example of an operation flowchart of the basestation to which the method and/or embodiment proposed in the presentdisclosure may be applied. FIG. 15 is only for convenience ofdescription, and does not limit the scope of the present disclosure.Referring to FIG. 15, it is assumed that the UE and/or the base stationoperate based on the methods and/or embodiments of the above-describedproposals 1 and 2. Some of the steps described in FIG. 15 may be mergedor omitted. In addition, in performing the procedures described below,the CSI-related operation of FIG. 7 may be considered/applied.

The BS may collectively mean an object that performs datatransmission/reception with the UE. For example, the BS may include oneor more TPs (Transmission Points), one or more TRPs (Transmission andReception Points), and the like. Furthermore, the TP and/or TRP mayinclude a panel, a transmission and reception unit, and the like of theBS. In addition, as described above, the TRP may be distinguishedaccording to information (e.g., index or ID) for a CORESET group (orCORESET pool). In one example, in the case that a single UE isconfigured to perform transmission/reception with multiple TRPs (orcells), this may mean that multiple CORESET groups (or CORESET pools)may be configured for the UE. A configuration for the CORESET group (orCORESET pool) may be performed through higher layer signaling (e.g., RRCsignaling).

The BS may transmit configuration information to the UE S1510. Theconfiguration information may be transmitted through higher layersignaling (for example, RRC or MAC-CE).

For example, the configuration information may include (i) CSI relatedconfiguration and (ii) configuration related to transmission powercontrol of an uplink channel (for example, PUSCH/PUCCH).

The CSI related configuration may include configuration information on areference signal for CSI and resource allocation information for CSIreporting. For example, the configuration information related to thereference signal may include information on the period at which thereference signal is transmitted and time domain behavior information ofthe reference signal. Also, the configuration information related to thereference signal may include information on a resource and/or a resourceset to which the reference signal is transmitted. Also, the CSI relatedconfiguration may include information on the CSI reporting setting. Forexample, whether CSI reporting is PUSCH-based CSI reporting orPUCCH-based CSI reporting may be configured based on the information onthe CSI reporting setting. For example, the CSI related configurationmay include information related to the CSI omission (or UCI omission)operation of the UE. For example, the CSI related configuration mayinclude information used to determine the priority of CSI (for example,a permutation method).

For example, the operation of transmitting configuration information bythe BS (100/200 of FIGS. 16 to 20) in the S1510 step to the UE (100/200of FIGS. 16 to 20) may be implemented by the devices of FIGS. 16 to 20to be described later. For example, referring to FIG. 17, one or moreprocessors 202 may control one or more transceivers 206 and/or one ormore memories 204 to transmit the configuration information. And one ormore transceivers 206 may transmit the configuration information to theUE.

The BS may transmit a CSI-RS to the UE S1520. In other words, the CSI-RSmay be transmitted based on the CSI related configuration. For example,the CSI-RS may be transmitted periodically, semi-continuously, oraperiodically. Also, the CSI-RS may be used for CSI measurement andcalculation by the UE.

For example, the operation of transmitting a CSI-RS by the BS (100/200of FIGS. 16 to 20) in the S1510 step to the UE (100/200 of FIGS. 16 to20) may be implemented by the devices of FIGS. 16 to 20 to be describedlater. For example, referring to FIG. 17, one or more processors 202 maycontrol one or more transceivers 206 and/or one or more memories 204 totransmit the CSI-RS. And one or more transceivers 206 may transmit theCSI-RS to the UE.

For example, the CSI may be measured/calculated based on the (enhanced)Type II CSI codebook, and may include information on a precoding matrix(e.g., PMI, etc.). For example, the CSI may include information relatedwith coefficients. The information related to the coefficients mayinclude at least one of i) information on the amplitude coefficient, ii)information on the phase coefficient, or iii) bitmap information relatedto the amplitude coefficient and the phase coefficient.

For example, the CSI may be measured/calculated based on the (improved)Type II CSI codebook and may include information on the precoding matrix(for example, PMI). For example, the CSI may include information relatedwith coefficients. The information related with coefficients may includeat least one of i) information on the amplitude coefficient, ii)information on the phase coefficient, or iii) bitmap information relatedto the amplitude coefficient and the phase coefficient.

The priority value may be determined based on at least one of i) a layerindex ii) an index of a spatial domain associated with/related to eachcomponent or iii) an index of a frequency domain associated with/relatedto each component. For example, the priority value may be determinedbased on i) a layer index ii) an index of a spatial domain associatedwith/related to each component, and iii) an index of a frequency domainassociated with/related to each component.

For example, the priority value may increase in an order in which ahigher index and a lower index of the indexes of the frequency domainassociated with/related to the components are sequentially crossed basedon a predefined specific index. The predefined specific index may beassociated with/related to an index in the frequency domain of astrongest coefficient among the coefficients. For example, thepredefined specific index may be ‘0’. As another example, the priorityvalue may increase in an ascending order of the index of the spatialregion.

For example, the priority value may increase in an order in which ahigher index and a lower index of the indexes of the frequency domainassociated with/related to the components are sequentially crossed basedon a predefined specific index. The predefined specific index may beassociated with/related to an index in the frequency domain of astrongest coefficient among the coefficients. For example, thepredefined specific index may be ‘0’. As another example, the priorityvalue may increase in an ascending order of the index of the spatialregion.

For example, the operation of receiving UCI including CSI by the BS(100/200 of FIGS. 16 to 20) in the S1530 step from the UE (100/200 ofFIGS. 16 to 20) through PUSCH may be implemented by the devices of FIGS.16 to 20 to be described later. For example, referring to FIG. 17, oneor more processors 202 may control one or more transceivers 206 and/orone or more memories 204 to receive UCI including CSI through PUSCH. Andone or more transceivers 206 may receive UCI including CSI from the UEthrough PUSCH.

In addition, the UE and/or the base station operating according to eachstep of the above-described methods and embodiments (e.g., proposal1/proposal 2, etc.), FIG. 13, 14 or 15, etc., may be specificallyimplemented by the device in FIGS. 16 to 20. For example, the basestation may correspond to a first radio device, the UE may correspond toa second radio device, and vice versa may be considered in some cases.

For example, the above-described base station/UE signaling and operation(e.g., FIGS. 13/14/15, etc.) may be processed by one or more processors(e.g., 102, 202) of FIGS. 16 to 20, and the above-described basestation/UE signaling and operation (e.g., FIGS. 13/14/15, etc.) may bestored in the memory (for example, one or more memory (for example, 104and 204) in FIGS. 16 to 20) in the form of an instruction/program (e.g.,instruction, executable code) for driving at least one processor (e.g.,102, 202) of FIGS. 16 to 20.

Example of Communication System to which Present Disclosure is Applied

Although not limited thereto, but various descriptions, functions,procedures, proposals, methods, and/or operation flowcharts of thepresent disclosure, which are disclosed in this document may be appliedto various fields requiring wireless communications/connections (e.g.,5G) between devices.

Hereinafter, the communication system will be described in more detailwith reference to drawings. In the following drawings/descriptions, thesame reference numerals will refer to the same or corresponding hardwareblocks, software blocks, or functional blocks if not differentlydescribed.

FIG. 16 illustrates a communication system applied to the presentdisclosure.

Referring to FIG. 16, a communication system 1 applied to the presentdisclosure includes a wireless device, a BS, and a network. Here, thewireless device may mean a device that performs communication by using awireless access technology (e.g., 5G New RAT (NR) or Long Term Evolution(LTE)) and may be referred to as a communication/wireless/5G device.Although not limited thereto, the wireless device may include a robot100 a. vehicles 100 b-1 and 100 b-2, an eXtended Reality (XR) device 100c, a hand-held device 100 d, a home appliance 100 e, an Internet ofThing (IoT) device 100 f, and an AI device/server 400. For example, thevehicle may include a vehicle with a wireless communication function, anautonomous driving vehicle, a vehicle capable of performinginter-vehicle communication, and the like. Here, the vehicle may includean Unmanned Aerial Vehicle (UAV) (e.g., drone). The XR device mayinclude an Augmented Reality (AR)/Virtual Reality (VR)/Mixed Reality(MR) device and may be implemented as a form such as a head-mounteddevice (HMD), a head-up display (HUD) provided in the vehicle, atelevision, a smart phone, a computer, a wearable device, a homeappliance device, digital signage, a vehicle, a robot, etc. Thehand-held device may include the smart phone, a smart pad, a wearabledevice (e.g., a smart watch, a smart glass), a computer (e.g., anotebook, etc.), and the like. The home appliance device may include aTV, a refrigerator, a washing machine, and the like. The IoT device mayinclude a sensor, a smart meter, and the like. For example, the BS andthe network may be implemented even the wireless device and a specificwireless device 200 a may operate an eNB/network node for anotherwireless device.

The wireless devices 100 a to 100 f may be connected to a network 300through a BS 200. An artificial intelligence (AI) technology may beapplied to the wireless devices 100 a to 100 f and the wireless devices100 a to 100 f may be connected to an AI server 400 through the network300. The network 300 may be configured by using a 3G network, a 4G(e.g., LTE) network, or a 5G (e.g., NR) network. The wireless devices100 a to 100 f may communicate with each other through the BS200/network 300, but may directly communicate with each other withoutgoing through the BS/network (sidelink communication). For example, thevehicles 100 b-1 and 100 b-2 may perform direct communication (e.g.,Vehicle to Vehicle (V2V)/Vehicle to everything (V2X) communication).Further, the IoT device (e.g., sensor) may perform direct communicationwith other IoT devices (e.g., sensor) or other wireless devices 100 a to100 f.

Wireless communications/connections 150 a, 150 b, and 150 c may be madebetween the wireless devices 100 a to 100 f and the BS 200 and betweenthe BS 200 and the BS 200. Here, the wireless communication/connectionmay be made through various wireless access technologies (e.g., 5G NR)such as uplink/downlink communication 150 a, sidelink communication 150b (or D2D communication), and inter-BS communication 150 c (e.g., relay,Integrated Access Backhaul (IAB). The wireless device and the BS/thewireless device and the BS and the BS may transmit/receive radio signalsto/from each other through wireless communications/connections 150 a,150 b, and 150 c. For example, the wireless communications/connections150 a, 150 b, and 150 c may transmit/receive signals through variousphysical channels. To this end, based on various proposals of thepresent disclosure, at least some of various configuration informationsetting processes, various signal processing processes (e.g., channelencoding/decoding, modulation/demodulation, resource mapping/demapping,etc.), a resource allocation process, and the like fortransmission/reception of the radio signal may be performed.

Example of Wireless Device to which Present Disclosure is Applied

FIG. 17 illustrates a wireless device which may be applied to thepresent disclosure.

Referring to FIG. 17, a first wireless device 100 and a second wirelessdevice 200 may transmit/receive radio signals through various wirelessaccess technologies (e.g., LTE and NR). Here, the first wireless device100 and the second wireless device 200 may correspond to a wirelessdevice 100 x and a BS 200 and/or a wireless device 100 x and a wirelessdevice 100 x of FIG. 16.

The first wireless device 100 may include one or more processors 102 andone or more memories 104 and additionally further include one or moretransceivers 106 and/or one or more antennas 108. The processor 102 maycontrol the memory 104 and/or the transceiver 106 and may be configuredto implement descriptions, functions, procedures, proposals, methods,and/or operation flows disclosed in the present disclosure. For example,the processor 102 may process information in the memory 104 and generatea first information/signal and then transmit a radio signal includingthe first information/signal through the transceiver 106. Further, theprocessor 102 may receive a radio signal including a secondinformation/signal through the transceiver 106 and then store in thememory 104 information obtained from signal processing of the secondinformation/signal. The memory 104 may connected to the processor 102and store various information related to an operation of the processor102. For example, the memory 104 may store a software code includinginstructions for performing some or all of processes controlled by theprocessor 102 or performing the descriptions, functions, procedures,proposals, methods, and/or operation flowcharts disclosed in the presentdisclosure. Here, the processor 102 and the memory 104 may be a part ofa communication modem/circuit/chip designated to implement the wirelesscommunication technology (e.g., LTE and NR). The transceiver 106 may beconnected to the processor 102 and may transmit and/or receive the radiosignals through one or more antennas 108. The transceiver 106 mayinclude a transmitter and/or a receiver. The transceiver 106 may be usedmixedly with a radio frequency (RF) unit. In the present disclosure, thewireless device may mean the communication modem/circuit/chip.

The second wireless device 200 may include one or more processors 202and one or more memories 204 and additionally further include one ormore transceivers 206 and/or one or more antennas 208. The processor 202may control the memory 204 and/or the transceiver 206 and may beconfigured to implement descriptions, functions, procedures, proposals,methods, and/or operation flows disclosed in the present disclosure. Forexample, the processor 202 may process information in the memory 204 andgenerate a third information/signal and then transmit a radio signalincluding the third information/signal through the transceiver 206.Further, the processor 202 may receive a radio signal including a fourthinformation/signal through the transceiver 206 and then store in thememory 204 information obtained from signal processing of the fourthinformation/signal. The memory 204 may connected to the processor 202and store various information related to an operation of the processor202. For example, the memory 204 may store a software code includinginstructions for performing some or all of processes controlled by theprocessor 202 or performing the descriptions, functions, procedures,proposals, methods, and/or operation flowcharts disclosed in the presentdisclosure. Here, the processor 202 and the memory 204 may be a part ofa communication modem/circuit/chip designated to implement the wirelesscommunication technology (e.g., LTE and NR). The transceiver 206 may beconnected to the processor 202 and may transmit and/or receive the radiosignals through one or more antennas 208. The transceiver 206 mayinclude a transmitter and/or a receiver and the transceiver 206 may bemixed with the RF unit. In the present disclosure, the wireless devicemay mean the communication modem/circuit/chip.

Hereinafter, hardware elements of the wireless devices 100 and 200 willbe described in more detail. Although not limited thereto, one or moreprotocol layers may be implemented by one or more processors 102 and202. For example, one or more processors 102 and 202 may implement oneor more layers (e.g., functional layers such as PHY, MAC, RLC, PDCP,RRC, and SDAP). One or more processors 102 and 202 may generate one ormore protocol data units (PDUs) and/or one or more service data units(SDUs) according to the descriptions, functions, procedures, proposals,methods, and/or operation flowcharts disclosed in the presentdisclosure. One or more processors 102 and 202 may generate a message,control information, data, or information according to the descriptions,functions, procedures, proposals, methods, and/or operation flowchartsdisclosed in the present disclosure. One or more processors 102 and 202may generate a signal (e.g., a baseband signal) including the PDU, theSDU, the message, the control information, the data, or the informationaccording to the function, the procedure, the proposal, and/or themethod disclosed in the present disclosure and provide the generatedsignal to one or more transceivers 106 and 206. One or more processors102 and 202 may receive the signal (e.g., baseband signal) from one ormore transceivers 106 and 206 and acquire the PDU, the SDU, the message,the control information, the data, or the information according to thedescriptions, functions, procedures, proposals, methods, and/oroperation flowcharts disclosed in the present disclosure.

One or more processors 102 and 202 may be referred to as a controller, amicrocontroller, a microprocessor, or a microcomputer. One or moreprocessors 102 and 202 may be implemented by hardware, firmware,software, or a combination thereof. As one example, one or moreApplication Specific Integrated Circuits (ASICs), one or more DigitalSignal Processors (DSPs), one or more Digital Signal Processing Devices(DSPDs), one or more Programmable Logic Devices (PLDs), or one or moreField Programmable Gate Arrays (FPGAs) may be included in one or moreprocessors 102 and 202. The descriptions, functions, procedures,proposals, and/or operation flowcharts disclosed in the presentdisclosure may be implemented by using firmware or software and thefirmware or software may be implemented to include modules, procedures,functions, and the like. Firmware or software configured to perform thedescriptions, functions, procedures, proposals, and/or operationflowcharts disclosed in the present disclosure may be included in one ormore processors 102 and 202 or stored in one or more memories 104 and204 and driven by one or more processors 102 and 202. The descriptions,functions, procedures, proposals, and/or operation flowcharts disclosedin the present disclosure may be implemented by using firmware orsoftware in the form of a code, the instruction and/or a set form of theinstruction.

One or more memories 104 and 204 may be connected to one or moreprocessors 102 and 202 and may store various types of data, signals,messages, information, programs, codes, instructions, and/or commands.One or more memories 104 and 204 may be configured by a ROM, a RAM, anEPROM, a flash memory, a hard drive, a register, a cache memory, acomputer reading storage medium, and/or a combination thereof. One ormore memories 104 and 204 may be positioned inside and/or outside one ormore processors 102 and 202. Further, one or more memories 104 and 204may be connected to one or more processors 102 and 202 through varioustechnologies such as wired or wireless connection.

One or more transceivers 106 and 206 may transmit to one or more otherdevices user data, control information, a wireless signal/channel, etc.,mentioned in the methods and/or operation flowcharts of the presentdisclosure. One or more transceivers 106 and 206 may receive from one ormore other devices user data, control information, a wirelesssignal/channel, etc., mentioned in the descriptions, functions,procedures, proposals, methods, and/or operation flowcharts disclosed inthe present disclosure. For example, one or more transceivers 106 and206 may be connected to one or more processors 102 and 202 and transmitand receive the radio signals. For example, one or more processors 102and 202 may control one or more transceivers 106 and 206 to transmit theuser data, the control information, or the radio signal to one or moreother devices. Further, one or more processors 102 and 202 may controlone or more transceivers 106 and 206 to receive the user data, thecontrol information, or the radio signal from one or more other devices.Further, one or more transceivers 106 and 206 may be connected to one ormore antennas 108 and 208 and one or more transceivers 106 and 206 maybe configured to transmit and receive the user data, controlinformation, wireless signal/channel, etc., mentioned in thedescriptions, functions, procedures, proposals, methods, and/oroperation flowcharts disclosed in the present disclosure through one ormore antennas 108 and 208. In the present disclosure one or moreantennas may be a plurality of physical antennas or a plurality oflogical antennas (e.g., antenna ports). One or more transceivers 106 and206 may convert the received radio signal/channel from an RF band signalto a baseband signal in order to process the received user data, controlinformation, radio signal/channel, etc., by using one or more processors102 and 202. One or more transceivers 106 and 206 may convert the userdata, control information, radio signal/channel, etc., processed byusing one or more processors 102 and 202, from the baseband signal intothe RF band signal. To this end, one or more transceivers 106 and 206may include an (analog) oscillator and/or filter.

Example of Signal Processing Circuit to which Present Disclosure isApplied

FIG. 18 illustrates a signal processing circuit for a transmit signal.

Referring to FIG. 18 a signal processing circuit 1000 may include ascrambler 1010, a modulator 1020, a layer mapper 1030, a precoder 1040,a resource mapper 1050, and a signal generator 1060. Although notlimited thereto, an operation/function of FIG. 18 may be performed bythe processors 102 and 202 and/or the transceivers 106 and 206 of FIG.17. Hardware elements of FIG. 18 may be implemented in the processors102 and 202 and/or the transceivers 106 and 206 of FIG. 17. For example,blocks 1010 to 1060 may be implemented in the processors 102 and 202 ofFIG. 17. Further, blocks 1010 to 1050 may be implemented in theprocessors 102 and 202 of FIG. 17 and the block 1060 may be implementedin the transceivers 106 and 206 of FIG. 17.

A codeword may be transformed into a radio signal via the signalprocessing circuit 1000 of FIG. 18. Here, the codeword is an encoded bitsequence of an information block. The information block may includetransport blocks (e.g., a UL-SCH transport block and a DL-SCH transportblock). The radio signal may be transmitted through various physicalchannels (e.g., PUSCH and PDSCH).

Specifically, the codeword may be transformed into a bit sequencescrambled by the scrambler 1010. A scramble sequence used for scramblingmay be generated based on an initialization value and the initializationvalue may include ID information of a wireless device. The scrambled bitsequence may be modulated into a modulated symbol sequence by themodulator 1020. A modulation scheme may include pi/2-Binary Phase ShiftKeying (pi/2-BPSK), m-Phase Shift Keying (m-PSK), m-Quadrature AmplitudeModulation (m-QAM), etc. A complex modulated symbol sequence may bemapped to one or more transport layers by the layer mapper 1030.Modulated symbols of each transport layer may be mapped to acorresponding antenna port(s) by the precoder 1040 (precoding). Output zof the precoder 1040 may be obtained by multiplying output y of thelayer mapper 1030 by precoding matrix W of N*M. Here, N represents thenumber of antenna ports and M represents the number of transport layers.Here, the precoder 1040 may perform precoding after performing transformprecoding (e.g., DFT transform) for complex modulated symbols. Further,the precoder 1040 may perform the precoding without performing thetransform precoding.

The resource mapper 1050 may map the modulated symbols of each antennaport to a time-frequency resource. The time-frequency resource mayinclude a plurality of symbols (e.g., CP-OFDMA symbol and DFT-s-OFDMAsymbol) in a time domain and include a plurality of subcarriers in afrequency domain. The signal generator 1060 may generate the radiosignal from the mapped modulated symbols and the generated radio signalmay be transmitted to another device through each antenna. To this end,the signal generator 1060 may include an Inverse Fast Fourier Transform(IFFT) module, a Cyclic Prefix (CP) insertor, a Digital-to-AnalogConverter (DAC), a frequency uplink converter, and the like.

A signal processing process for a receive signal in the wireless devicemay be configured in the reverse of the signal processing process (1010to 1060) of FIG. 18. For example, the wireless device (e.g., 100 or 200of FIG. 17) may receive the radio signal from the outside through theantenna port/transceiver. The received radio signal may be transformedinto a baseband signal through a signal reconstructor. To this end, thesignal reconstructer may include a frequency downlink converter, ananalog-to-digital converter (ADC), a CP remover, and a Fast FourierTransform (FFT) module. Thereafter, the baseband signal may bereconstructed into the codeword through a resource de-mapper process, apostcoding process, a demodulation process, and a de-scrambling process.The codeword may be reconstructed into an original information block viadecoding. Accordingly, a signal processing circuit (not illustrated) forthe receive signal may include a signal reconstructer, a resourcedemapper, a postcoder, a demodulator, a descrambler, and a decoder.

Utilization Example of Wireless Device to which Present Disclosure isApplied

FIG. 19 illustrates another example of a wireless device applied to thepresent disclosure. The wireless device may be implemented as varioustypes according to a use example/service (see FIG. 16).

Referring to FIG. 19, wireless devices 100 and 200 may correspond to thewireless devices 100 and 200 of FIG. 17 and may be constituted byvarious elements, components, units, and/or modules. For example, thewireless devices 100 and 200 may include a communication unit 110, acontrol unit 120, and a memory unit 130, and an additional element 140.The communication unit may include a communication circuit 112 and atransceiver(s) 114. For example, the communication circuit 112 mayinclude one or more processors 102 and 202 and/or one or more memories104 and 204 of FIG. 16. For example, the transceiver(s) 114 may includeone or more transceivers 106 and 206 and/or one or more antennas 108 and208 of FIG. 16. The control unit 120 is electrically connected to thecommunication unit 110, the memory unit 130, and the additional element140 and controls an overall operation of the wireless device. Forexample, the control unit 120 may an electrical/mechanical operation ofthe wireless device based on a program/code/instruction/informationstored in the memory unit 130. Further, the control unit 120 maytransmit the information stored in the memory unit 130 to the outside(e.g., other communication devices) through the communication unit 110via a wireless/wired interface or store information received from theoutside (e.g., other communication devices) through the wireless/wiredinterface through the communication unit 110.

The additional element 140 may be variously configured according to thetype of wireless device. For example, the additional element 140 mayinclude at least one of a power unit/battery, an input/output (I/O)unit, a driving unit, and a computing unit. Although not limitedthereto, the wireless device may be implemented as a form such as therobot 100 a of FIG. 16, the vehicles 100 b-1 and 100 b-2 of FIG. 16, theXR device 100 c of FIG. 16, the portable device 100 d of FIG. 16, thehome appliance 100 e of FIG. 16, the IoT device 100 f of FIG. 16, adigital broadcasting terminal, a hologram device, a public safetydevice, an MTC device, a medical device, a fintech device (or financialdevice), a security device, a climate/environment device, an AIserver/device 400 of FIG. 16, the BS 200 of FIG. 16, a network node,etc. The wireless device may be movable or may be used at a fixed placeaccording to a use example/service.

In FIG. 19, all of various elements, components, units, and/or modulesin the wireless devices 100 and 200 may be interconnected through thewired interface or at least may be wirelessly connected through thecommunication unit 110. For example, the control unit 120 and thecommunication 110 in the wireless devices 100 and 200 may be wiredlyconnected and the control unit 120 and the first unit (e.g., 130 or 140)may be wirelessly connected through the communication unit 110. Further,each element, component, unit, and/or module in the wireless devices 100and 200 may further include one or more elements. For example, thecontrol unit 120 may be constituted by one or more processor sets. Forexample, the control unit 120 may be configured a set of a communicationcontrol processor, an application processor, an electronic control unit(ECU), a graphic processing processor, a memory control processor, etc.As another example, the memory 130 may be configured as a random accessmemory (RAM), a dynamic RAM (DRAM), a read only memory (ROM), a flashmemory, a volatile memory, a non-volatile memory, and/or combinationsthereof.

Example of Hand-Held Device to which Present Disclosure is Applied

FIG. 20 illustrates a hand-held device applied to the presentdisclosure. The hand-held device may include a smart phone, a smart pad,a wearable device (e.g., a smart watch, a smart glass), and a hand-heldcomputer (e.g., a notebook, etc.). The hand-held device may be referredto as a Mobile Station (MS), a user terminal (UT), a Mobile SubscriberStation (MSS), a Subscriber Station (SS), an Advanced Mobile Station(AMS), or a Wireless terminal (WT).

Referring to FIG. 20, a hand-held device 100 may include an antenna unit108, a communication unit 110, a control unit 120, a memory unit 130, apower supply unit 140 a, an interface unit 140 b, and an input/outputunit 140 c. The antenna unit 108 may be configured as a part of thecommunication unit 110. The blocks 110 to 130/140 a to 140 c correspondto the blocks 110 to 130/140 of FIG. 19, respectively.

The communication unit 110 may transmit/receive a signal (e.g., data, acontrol signal, etc.) to/from another wireless device and BSs. Thecontrol unit 120 may perform various operations by controllingcomponents of the hand-held device 100. The control unit 120 may includean Application Processor (AP). The memory unit 130 may storedata/parameters/programs/codes/instructions required for driving thehand-held device 100. Further, the memory unit 130 may storeinput/output data/information, etc. The power supply unit 140 a maysupply power to the hand-held device 100 and include a wired/wirelesscharging circuit, a battery, and the like. The interface unit 140 b maysupport a connection between the hand-held device 100 and anotherexternal device. The interface unit 140 b may include various ports(e.g., an audio input/output port, a video input/output port) for theconnection with the external device. The input/output unit 140 c mayreceive or output a video information/signal, an audioinformation/signal, data, and/or information input from a user. Theinput/output unit 140 c may include a camera, a microphone, a user inputunit, a display unit 140 d, a speaker, and/or a haptic module.

As one example, in the case of data communication, the input/output unit140 c may acquire information/signal (e.g., touch, text, voice, image,and video) input from the user and the acquired information/signal maybe stored in the memory unit 130. The communication unit 110 maytransform the information/signal stored in the memory into the radiosignal and directly transmit the radio signal to another wireless deviceor transmit the radio signal to the eNB. Further, the communication unit110 may receive the radio signal from another wireless device or eNB andthen reconstruct the received radio signal into originalinformation/signal. The reconstructed information/signal may be storedin the memory unit 130 and then output in various forms (e.g., text,voice, image, video, haptic) through the input/output unit 140 c.

The embodiments described above are implemented by combinations ofcomponents and features of the present disclosure in predeterminedforms. Each component or feature should be considered selectively unlessspecified separately. Each component or feature may be carried outwithout being combined with another component or feature. Moreover, somecomponents and/or features are combined with each other and canimplement embodiments of the present disclosure. The order of operationsdescribed in embodiments of the present disclosure may be changed. Somecomponents or features of one embodiment may be included in anotherembodiment, or may be replaced by corresponding components or featuresof another embodiment. It is apparent that some claims referring tospecific claims may be combined with another claims referring to theclaims other than the specific claims to constitute the embodiment oradd new claims by means of amendment after the application is filed.

Embodiments of the present disclosure can be implemented by variousmeans, for example, hardware, firmware, software, or combinationsthereof. When embodiments are implemented by hardware, one embodiment ofthe present disclosure can be implemented by one or more applicationspecific integrated circuits (ASICs), digital signal processors (DSPs),digital signal processing devices (DSPDs), programmable logic devices(PLDs), field programmable gate arrays (FPGAs), processors, controllers,microcontrollers, microprocessors, and the like.

When embodiments are implemented by firmware or software, one embodimentof the present disclosure can be implemented by modules, procedures,functions, etc. performing functions or operations described above.Software code can be stored in a memory and can be driven by aprocessor. The memory is provided inside or outside the processor andcan exchange data with the processor by various well-known means.

It is apparent to those skilled in the art that the present disclosurecan be embodied in other specific forms without departing from essentialfeatures of the present disclosure. Accordingly, the aforementioneddetailed description should not be construed as limiting in all aspectsand should be considered as illustrative. The scope of the presentdisclosure should be determined by rational construing of the appendedclaims, and all modifications within an equivalent scope of the presentdisclosure are included in the scope of the present disclosure.

INDUSTRIAL APPLICABILITY

The method for mapping channel state information in a wirelesscommunication system of the present disclosure has been describedfocusing on examples applied to the 3GPP LTE/LTE-A system and 5G system(New RAT system), but can be applied to various wireless communicationsystems.

1. A method of reporting channel state information (CSI) throughphysical uplink shared channel (PUSCH), by a user equipment (UE), in awireless communication system, the method comprising: receiving, from abase station, configuration information, wherein the configurationinformation includes (i) a CSI related configuration and (ii) aconfiguration related to transmission power control of the PUSCH;receiving, from the base station, a CSI-reference signal (CSI-RS) basedon the CSI related configuration; obtaining CSI based on the CSI-RS,wherein the CSI includes information related to coefficients, whereineach of elements of the information related to the coefficients isclassified as a plurality of groups based on a priority value, whereinthe priority value is determined based on i) a layer index, ii) an indexof a spatial domain related to each of the element and iii) an index ofa frequency domain related to each of the elements, and wherein thepriority value increases as an order in which a higher index and a lowerindex of indexes of a frequency domain related to the elements aresequentially crossed based on a predefined specific index; andtransmitting, to the base station, a CSI report configured by omitting,among the plurality of groups, a portion of the plurality of groupsbased on a pre-defined priority of the plurality of groups, through thePUSCH, wherein a transmission power of the PUSCH is determined based onthe configuration information.
 2. (canceled)
 3. The method of claim 1,wherein the smaller the priority value, the higher the priority of eachelement.
 4. The method of claim 1, wherein the priority value increasesin an ascending order of the index of the spatial domain.
 5. The methodof claim 1, wherein a priority of i) the index of the spatial domain ofa strongest coefficient and ii) an index of the spatial domaincorresponding to a beam having an opposite polarization with respect toa beam corresponding to the strongest coefficient is the highest.
 6. Themethod of claim 1, wherein the predefined specific index is related toan index in the frequency domain of a strongest coefficient among thecoefficients.
 7. The method of claim 1, wherein the predefined specificindex is
 0. 8. The method of claim 1, wherein the CSI report consists ofa first part and a second part, and wherein the CSI report is omitted inthe second part.
 9. The method of claim 1, wherein the CSI reportfurther includes information related to omission of the portion amongthe plurality of groups.
 10. The method of claim 9, wherein theinformation related to the omission includes at least one of (i)information on whether to omit, (ii) information on an object to beomitted or (iii) information on a quantity to be omitted.
 11. The methodof claim 1, wherein the information related with coefficients includesat least one of information on an amplitude coefficient, ii) informationon a phase coefficient, or iii) bitmap information related to theamplitude coefficient and the phase coefficient.
 12. The method of claim1, wherein a resource region for transmitting the PUSCH is allocatedbased on the CSI related configuration, and wherein a payload size ofthe computed CSI exceeds the resource region.
 13. A user equipment (UE)to report channel state information (CSI) through physical uplink sharedchannel (PUSCH) in a wireless communication system, the UE comprising:one or more transceivers; one or more processors; and one or morememories storing instructions for operations executed by the one or moreprocessors and coupled to the one or more processors, wherein theoperations comprise: receiving, from a base station, configurationinformation, wherein the configuration information includes (i) a CSIrelated configuration and (ii) a configuration related to transmissionpower control of the PUSCH; receiving, from the base station, aCSI-reference signal (CSI-RS) based on the CSI related configuration;obtaining CSI based on the CSI-RS, wherein the CSI includes informationrelated to coefficients, wherein each of elements of the informationrelated to the coefficients is classified as a plurality of groups basedon a priority value, wherein the priority value is determined based oni) a layer index, ii) an index of a spatial domain related to each ofthe element and iii) an index of a frequency domain related to each ofthe elements, and wherein the priority value increases as an order inwhich a higher index and a lower index of indexes of a frequency domainrelated to the elements are sequentially crossed based on a predefinedspecific index; and transmitting, to the base station, a CSI reportconfigured by omitting, among the plurality of groups, a portion of theplurality of groups based on a pre-defined priority of the plurality ofgroups, through the PUSCH, wherein a transmission power of the PUSCH isdetermined based on the configuration information. 14-16. (canceled) 17.A method of receiving channel state information (CSI) through physicaluplink shared channel (PUSCH), by a base station, in a wirelesscommunication system, the method comprising: transmitting, to a userequipment (UE), configuration information, wherein the configurationinformation includes (i) a CSI related configuration and (ii) aconfiguration related to transmission power control of the PUSCH;transmitting, to the UE, a CSI-reference signal (CSI-RS) based on theCSI related configuration; and receiving, from the UE, a CSI reportincluding CSI measured based on the CSI-RS, through the PUSCH, whereinthe CSI includes information related to coefficients, wherein each ofelements of the information related to the coefficients is classified asa plurality of groups based on a priority value, wherein the priorityvalue is determined based on i) a layer index, ii) an index of a spatialdomain related to each of the element and iii) an index of a frequencydomain related to each of the elements, and wherein the priority valueincreases as an order in which a higher index and a lower index ofindexes of a frequency domain related to the elements are sequentiallycrossed based on a predefined specific index, wherein the CSI report isconfigured by omitting, among the plurality of groups, a portion of theplurality of groups based on a pre-defined priority of the plurality ofgroups, and wherein a transmission power of the PUSCH is determinedbased on the configuration information. 18-20. (canceled)